SMTP Problem since update v9

Hello everyone,

Since the v9 upgrade, I can no longer send mail. Mail reception is ok.
I tried on 2 different PCs, on my main pc, it doesn’t work but on other pc it works, so I don’t understand.

Here are the logs:

17:29:27.086|021|   SMTP S: 220 2.0.0 Ready to start TLS
17:29:27.124|021|   Exception: MailClient.Accounts.ConnectionException: La connexion a échoué pour la raison suivante:
17:29:27.124|021|     "Authentication failed, see inner exception."
17:29:27.124|021|    ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception.
17:29:27.124|021|    ---> System.ComponentModel.Win32Exception (0x80090302): La fonction demandée n’est pas prise en charge
17:29:27.124|021|      --- End of inner exception stack trace ---
17:29:27.124|021|      at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm)
17:29:27.124|021|      at System.Net.Security.SslStream.AuthenticateAsClient(SslClientAuthenticationOptions sslClientAuthenticationOptions)
17:29:27.124|021|      at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost, X509CertificateCollection clientCertificates, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation)
17:29:27.124|021|      at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost)
17:29:27.124|021|      at MailClient.Protocols.Smtp.SmtpSendCommand.StartTls()
17:29:27.124|021|      at MailClient.Protocols.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
17:29:27.124|021|      --- End of inner exception stack trace ---
17:29:27.124|021|      at MailClient.Protocols.Smtp.SmtpSendCommand.Connect(WorkerStatus status)
17:29:27.124|021|      at MailClient.Protocols.Smtp.SmtpSendCommand.Execute(WorkerStatus status)
17:29:27.125|021|      at MailClient.Commands.Command.Process(WorkerStatus status)
17:29:27.125|00B|   AccountBase.ChangeOnlineState : State changed to OFFLINE due BrokenConnection

Can you help me to fix this problem please ?
Thank you :slight_smile: