Invalid first reply

The last several days I’ve experienced frequent errors and am unable to send or receive e-mail though intermittently, some mail is successfully delivered.

I’m using eMClient version 6.0.24928.0

Here is a copy of recent log entries: 

9:05:59 AM [GData]  Synchronizing folder list
9:05:59 AM [POP3]  Connecting: To
9:05:59 AM [IMAP]  Synchronizing subfolders: For folder
9:06:00 AM [GData]  Synchronizing folder list
9:06:00 AM [GData]  Synchronizing folder ‘’
9:06:00 AM   MailExceptions.Exception: Invalid first reply: 
9:06:00 AM    at MailClient.Pop3.Pop3ReceiveCommand.Connect(WorkerStatus status)
9:06:00 AM    at MailClient.Pop3.Pop3ReceiveCommand.Execute(WorkerStatus status)
9:06:00 AM    at MailClient.Commands.Command.Process(WorkerStatus status)
9:06:00 AM [IMAP]  MailExceptions.ConnectionException: Failed opening connection to server.
9:06:00 AM ()
9:06:00 AM    at MailClient.Imap.ConnectionPoolEntry.Reconnect()
9:06:00 AM    at MailClient.Imap.ConnectionPoolEntry.Connect()
9:06:00 AM    at MailClient.Imap.ConnectionPool.AcquireConnection(Folder mailFolder, Boolean idle, Boolean forStore)
9:06:00 AM    at MailClient.Imap.ConnectionContext…ctor(ImapAccount account)
9:06:00 AM    at MailClient.Imap.Synchronizer.SynchronizeFoldersCommand.ExecuteInternal(WorkerStatus status)
9:06:00 AM    at MailClient.Imap.Synchronizer.ImapCommand.Execute(WorkerStatus status)
9:06:00 AM    at MailClient.Commands.Command.Process(WorkerStatus status)

I will appreciate your assistance.

Thank you!

the problem seems to be with your POP commspeed account.
Are you having trouble receiving messages for this account?
Is there any error message in the Tools>Operations>Error tab?


Hi Olivia.  Thank you.  Yes, there are error messages in the Tools>Operations>Error tab.  The most recent one is: Connecting to failed.
[SMTP]  An attempt to connect to failed.  This could be caused by temporary server unavailability or incorrect settings. Do you want to check the settings?

When I check the settings they are fine.  Trying to “fix” the settings in the Diagnostic area does not fix the problem.



Hello Greg,
please try manually changin the Server policy in the SMTP tab in the Accounts window.
I suggest trying the (legacy) option which is usually more compatible with older server settings.


Thanks, Olivia.
The Server policy on the SMTP tab (as well as the POP tab) is already set to “Legacy” with a special port as specified by my ISP.  I have checked with the ISP multiple times and they indicate that all is well at their end.  I’ve also determined that the web mail version of their service is working fine.  I much prefer to use eM Client when it’s working.


Hello Greg,
can you try making exception for eM Client in your Windows firewall and antivirus software?


Hi Olivia,

I’ve made an exception in both my anti-virus and windows firewall.  Still seem to be having the problem.