outlook.com connection failure

I’ve just installed eM Client and I am trying to use it with my Outlook.com account. When I try to send/receive a message saying the connection failed “this could be caused by temporary server unavailability or incorrect settings”. 
I have entered my email address and password and let em client automatically do the rest. 
What else do I need to do?

I am no longer getting the error message, but I cannot see anything in my in box. 

Hi Steve,
could you check the Tools > Operations > Log window after your account tried to synchronize and copy the content of this log here for me?

Regards,
Olivia

Hi Olivia, here it is.

5:03:38 PM Online state: changed to online due to NetworkAvailability 5:03:38 PM steve-mcmullen@outlook.com [AirSync]  Synchronizing folder list
5:03:44 PM steve-mcmullen@outlook.com [AirSync]  Synchronizing folder list
5:03:45 PM steve-mcmullen@outlook.com [AirSync]  Synchronizing folder list
5:03:47 PM steve-mcmullen@outlook.com [AirSync]  Synchronizing folder ‘steve-mcmullen@outlook.com/Junk Email/’
5:03:47 PM steve-mcmullen@outlook.com [AirSync]  MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:03:47 PM    at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken) 5:03:47 PM &nbsp; &nbsp;at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken) 5:03:47 PM &nbsp; &nbsp;at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass2e.<>c__DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
5:03:47 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:03:47 PM — End of inner exception stack trace —
5:03:47 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:03:47 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:04:45 PM Online state: changed to offline due to NetworkAvailability
5:06:01 PM Online state: changed to online due to NetworkAvailability
5:06:01 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:06:03 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:06:05 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:06:05 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:06:05 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:06:05 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:06:05 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass2e.<>c DisplayClass33.b 2a(WorkerStatus status, CancellationToken cancellationToken)
5:06:05 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:06:05 PM — End of inner exception stack trace —
5:06:05 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:06:05 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:07:06 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:07:09 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:07:09 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:07:09 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:07:09 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:07:09 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c DisplayClass2e.<>c DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
5:07:09 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:07:09 PM — End of inner exception stack trace —
5:07:09 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:07:09 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:13:38 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:13:40 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:13:40 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:13:40 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:13:40 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:13:40 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass2e.<>c DisplayClass33.b 2a(WorkerStatus status, CancellationToken cancellationToken)
5:13:40 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:13:40 PM — End of inner exception stack trace —
5:13:40 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:13:40 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:23:38 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:23:41 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:23:41 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:23:41 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:23:41 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:23:41 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c DisplayClass2e.<>c DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
5:23:41 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:23:41 PM — End of inner exception stack trace —
5:23:41 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:23:41 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:33:38 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:33:40 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:33:40 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:33:40 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:33:40 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:33:40 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass2e.<>c DisplayClass33.b 2a(WorkerStatus status, CancellationToken cancellationToken)
5:33:40 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:33:40 PM — End of inner exception stack trace —
5:33:40 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:33:40 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:43:38 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:43:40 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:43:42 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:43:42 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:43:42 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:43:42 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c DisplayClass2e.<>c DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
5:43:42 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:43:42 PM — End of inner exception stack trace —
5:43:42 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:43:42 PM at MailClient.Commands.Command.Process(WorkerStatus status)
5:53:38 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
5:53:40 PM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
5:53:40 PM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
5:53:40 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>5:53:40 PM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>5:53:40 PM at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass2e.<>c DisplayClass33.b 2a(WorkerStatus status, CancellationToken cancellationToken)
5:53:40 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:53:40 PM — End of inner exception stack trace —
5:53:40 PM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
5:53:40 PM at MailClient.Commands.Command.Process(WorkerStatus status)
6:01:50 PM Online state: changed to offline due to NetworkAvailability
9:27:42 AM Online state: changed to online due to NetworkAvailability
9:27:42 AM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list
9:28:18 AM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: The remote name could not be resolved: ‘m.hotmail.com’ —> System.Net.WebException: The remote name could not be resolved: 'm.hotmail.com
9:28:18 AM at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
9:28:18 AM at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult)
9:28:18 AM at MailClient.Protocols.AirSync.Protocol.ActiveSyncCommandRequest.GetRequestStream(CancellationToken cancellationToken)
9:28:18 AM at MailClient.Protocols.AirSync.Protocol.ActiveSyncCommandRequest.GetXmlWriter(CancellationToken cancellationToken)
9:28:18 AM at MailClient.Protocols.AirSync.AirSyncFolderSynchronizer.GetFolderList(Folder homeFolder, CancellationToken cancellationToken)
9:28:18 AM at MailClient.Protocols.Common.FolderSynchronizer.<>c DisplayClass5.b 0(WorkerStatus status, CancellationToken cancellationToken)
9:28:18 AM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
9:28:18 AM — End of inner exception stack trace —
9:28:18 AM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
9:28:18 AM at MailClient.Commands.Command.Process(WorkerStatus status)
9:35:43 AM steve-mcmullen@outlook.com [AirSync] Synchronizing folder list9:35:45 AM steve-mcmullen@outlook.com [AirSync] Synchronizing folder 'steve-mcmullen@outlook.com/Junk Email/'
9:35:46 AM steve-mcmullen@outlook.com [AirSync] MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
9:35:46 AM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)<br>9:35:46 AM at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)<br>9:35:46 AM at MailClient.Protocols.Common.ItemSynchronizer2.<>c DisplayClass2e.<>c DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
9:35:46 AM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
9:35:46 AM — End of inner exception stack trace —
9:35:46 AM at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
9:35:46 AM at MailClient.Commands.Command.Process(WorkerStatus status)

Hi Steve,
we might have a fix for this but it is not public yet. Could you perhaps contact me at rust@emclient.com with a link to this forum topic?

Regards,
Olivia

Hi Olivia
I’m having a similar problem and am hopeful that you could help - the diagnosis keeps failing on SMTP when trying to send/ receive to my outlook account.  My log is below if that is of use:

Regards
Phil Coutie

4:19:30 PM Online state: changed to online due to NetworkAvailability
4:20:58 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:21:02 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:21:02 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:21:02 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:21:02 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:21:02 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:21:02 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:21:02 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:21:02 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:21:02 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:21:02 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:21:02 PM    — End of inner exception stack trace —
4:21:02 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:21:02 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:21:02 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:21:02 PM pop3@hotmail.com [POP3]  Connecting: To pop3@hotmail.com
4:21:04 PM pop3@hotmail.com [POP3]  Connected: To pop3@hotmail.com
4:21:04 PM pop3@hotmail.com [POP3]  Downloading messages: From pop3@hotmail.com
4:21:22 PM pop3@hotmail.com [POP3]  Disconnected: From pop3@hotmail.com
4:21:22 PM pop3@hotmail.com [POP3]  Disconnected: Done
4:23:07 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:23:08 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:23:08 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:23:08 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:23:08 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:23:08 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:23:08 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:23:08 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:23:08 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:23:08 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:23:08 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:23:08 PM    — End of inner exception stack trace —
4:23:08 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:23:08 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:23:08 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:23:08 PM pop3@hotmail.com [POP3]  Connecting: To pop3@hotmail.com
4:23:09 PM pop3@hotmail.com [POP3]  Connected: To pop3@hotmail.com
4:23:10 PM pop3@hotmail.com [POP3]  Downloading messages: From pop3@hotmail.com
4:23:10 PM pop3@hotmail.com [POP3]  Disconnected: From pop3@hotmail.com
4:23:10 PM pop3@hotmail.com [POP3]  Disconnected: Done
4:23:19 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:23:20 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:23:20 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:23:20 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:23:20 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:23:20 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:23:20 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:23:20 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:23:20 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:23:20 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:23:20 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:23:20 PM    — End of inner exception stack trace —
4:23:20 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:23:20 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:23:20 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:23:20 PM pop3@hotmail.com [POP3]  Connecting: To pop3@hotmail.com
4:23:21 PM pop3@hotmail.com [POP3]  Connected: To pop3@hotmail.com
4:23:21 PM pop3@hotmail.com [POP3]  Downloading messages: From pop3@hotmail.com
4:23:22 PM pop3@hotmail.com [POP3]  Disconnected: From pop3@hotmail.com
4:23:22 PM pop3@hotmail.com [POP3]  Disconnected: Done
4:23:41 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:23:42 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:23:42 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:23:42 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:23:42 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:23:42 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:23:42 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:23:42 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:23:42 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:23:42 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:23:42 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:23:42 PM    — End of inner exception stack trace —
4:23:42 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:23:42 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:23:42 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:24:12 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:24:13 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:24:13 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:24:13 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:24:13 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:24:13 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:24:13 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:24:13 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:24:13 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:24:13 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:24:13 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:24:13 PM    — End of inner exception stack trace —
4:24:13 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:24:13 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:24:13 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:24:18 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:24:18 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:24:18 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:24:18 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:24:18 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:24:18 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:24:18 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:24:18 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:24:18 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:24:18 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:24:18 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:24:18 PM    — End of inner exception stack trace —
4:24:18 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:24:18 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:24:18 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:24:18 PM pop3@hotmail.com [POP3]  Connecting: To pop3@hotmail.com
4:24:20 PM pop3@hotmail.com [POP3]  Connected: To pop3@hotmail.com
4:24:21 PM pop3@hotmail.com [POP3]  Downloading messages: From pop3@hotmail.com
4:24:21 PM pop3@hotmail.com [POP3]  Disconnected: From pop3@hotmail.com
4:24:21 PM pop3@hotmail.com [POP3]  Disconnected: Done
4:24:25 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:24:25 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:24:25 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:24:25 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:24:25 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:24:25 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:24:25 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:24:25 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:24:25 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:24:25 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:24:25 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:24:25 PM    — End of inner exception stack trace —
4:24:25 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:24:25 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:24:25 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:25:06 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:25:06 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:25:06 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:25:06 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:25:06 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:25:06 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:25:06 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:25:06 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:25:06 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:25:06 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:25:06 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:25:06 PM    — End of inner exception stack trace —
4:25:06 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:25:06 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:25:06 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:25:31 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:25:32 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:25:32 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:25:32 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:25:32 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:25:32 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:25:32 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:25:32 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:25:32 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:25:32 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:25:32 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:25:32 PM    — End of inner exception stack trace —
4:25:32 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:25:32 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:25:32 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:29:30 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:29:31 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:29:31 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:29:31 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:29:31 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:29:31 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:29:31 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:29:31 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:29:31 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:29:31 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:29:31 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:29:31 PM    — End of inner exception stack trace —
4:29:31 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:29:31 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:29:31 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:29:31 PM pop3@hotmail.com [POP3]  Connecting: To pop3@hotmail.com
4:29:32 PM pop3@hotmail.com [POP3]  Connected: To pop3@hotmail.com
4:29:32 PM   MailExceptions.OperationException: Message listing failed due to the following reason:
4:29:32 PM     “-ERR Exceeded the login limit for a 15 minute period. Reduce the frequency of requests to the POP3 server.”
4:29:32 PM    at MailClient.Pop3.Pop3ReceiveCommand.Execute(WorkerStatus status)
4:29:32 PM    at MailClient.Commands.Command.Process(WorkerStatus status)
4:32:20 PM pop3@hotmail.com [SMTP]  Connecting: To pop3@hotmail.com
4:32:21 PM pop3@hotmail.com [SMTP]  MailExceptions.ConnectionException: Connection failed due to the following reason:
4:32:21 PM     “The handshake failed due to an unexpected packet format.” —> System.IO.IOException: The handshake failed due to an unexpected packet format.
4:32:21 PM    at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
4:32:21 PM    at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:32:21 PM    at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
4:32:21 PM    at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
4:32:21 PM    at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
4:32:21 PM    at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
4:32:21 PM    at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
4:32:21 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:32:21 PM    — End of inner exception stack trace —
4:32:21 PM    at MailClient.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
4:32:21 PM    at MailClient.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
4:32:21 PM    at MailClient.Commands.Command.Process(WorkerStatus status)

Hi Phil,
can you make exceptions for eM Client in your Windows firewall and anti-virus software?

Regards,
Olivia

Hi Olivia

Thanks for getting back to me.  I’ve made eM Client an exception in anti-virus (AVG) and Windows Defender is not switched on - still no change; I did reboot to see if that was necessary after the changes, but no effect.

Regards
Phil

Unfortunately same issue here with a outlook.com account. Is there a fix? I am running Windows10.

19:15:08 Online state: changed to online due to NetworkAvailability 19:15:08 rcvanhouten@outlook.com [AirSync]  Mappenlijst aan het synchroniseren
19:15:12 rcvanhouten@outlook.com [AirSync]  Mappenlijst aan het synchroniseren
19:15:14 rcvanhouten@outlook.com [AirSync]  Map ‘rcvanhouten@outlook.com/Postvak IN/’ aan het synchroniseren
19:15:15 rcvanhouten@outlook.com [AirSync]  MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.
19:15:15    at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken) 19:15:15 &nbsp; &nbsp;at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken) 19:15:15 &nbsp; &nbsp;at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass2e.<>c__DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
19:15:15 at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
19:15:15 — End of inner exception stack trace —
19:15:15 at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)
19:15:15 at MailClient.Commands.Command.Process(WorkerStatus status)

Hi Eric,
I’m afraid this issue is connected to Microsoft’s decision to discontinue AirSync/ActiveSync support. Some outlook accounts mail servers are slowly having this option deactivated so your account can no longer synchronize using AirSync.
I have to suggest setting up your outlook account as IMAP manually in Tools>Accounts and New Account>Mail>Other.
This will only sync your mail and not your calendar or contacts. We’re working on a way to sync Calendar and Contact with the IMAP option and will try to release it as soon as possible.
Thank you for your patience.

Regards,
Olivia

Thanks, this explains why… the IMAP solution sounds fair enough for now.
Hope you will find a solution for contact and calendar soon.

I revised the new settings on microsoft web, they replaced m.hotmail.com by s.outlook.com.
You can change that info on server box in the outlook.com configuration, the airsync issues has disappeared, at the moment (at least).

Hi Jose,
thank you for sharing your solution, Microsoft just released the news about changing their accounts to an Exchange type of protocol instead of previously announced IMAP, so we’re figuring out what that will change for the Desktop mail programs.
Thank you for your patience.

Regards,
Olivia

Hi, Olivia! I have a similar problem. Version eM Client -the latest - I installed it for the first time today. Job as name server s.outlook.com -did not help. I noticed that on the server side Outlook.com a few days ago, there have been major changes, it affected web solutions, the Outlook has also become unstable to send mail etc. But eM Client does not see any emails in any folder!

P.S.
My mailbox is served by the service Outlook.com (Exchange ActiveSync)

Hi,

Sorry, unfortunately we do not support Exchange ActiveSync. The only way would be to set up your emails via IMAP.

Very sorry I couldn’t be of more help.

Regards,
Dave

Hi there

I have a similar-sounding problem.

I’ve been using eM Client for several months and I have configured it for 2 accounts.  The Gmail account is OK but, all the emails in my Hotmail (Outlook) have vanished.  I rebooted, tried the Repair tool and finally deleted the account altogether.
When I re-added the account, the folder names synchronise but no emails.

Here’s the log (with my email address changed):

17:20:49 xxxxx_xxxxx@hotmail.com[AirSync]  MailExceptions.ConnectionException: Found invalid data while decoding. —> System.IO.InvalidDataException: Found invalid data while decoding.

 17:40:45    at MailClient.Protocols.AirSync.AirSyncItemSynchronizer`2.GetSyncKey(Folder folder, IItemContext context, CancellationToken cancellationToken)

 17:40:45    at MailClient.Protocols.AirSync.AirSyncItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)

 17:40:45    at MailClient.Protocols.Common.ItemSynchronizer`2.<>c__DisplayClass2e.<>c__DisplayClass33.b__2a(WorkerStatus
status, CancellationToken cancellationToken)

 17:40:45    at MailClient.Protocols.AirSync.AirSyncGenericCommand.Execute(WorkerStatus status)

 17:40:45    — End of inner exception stack trace —

Any help would be appreciated.

Edit:
Deleted both mail accounts from eM Client then uninstalled.
After re-installing and configuring the accounts, everything came back.
I wonder if the problem had anything to do with the changes made to Outlook recently.

Problems seem solved with Em update