YAM-FAQ - When sending mail via smtp.gmail.com, YAM returns an error upon terminating the connection. However, the mail will be correctly send to its recipient.

It seems that this is a problem/bug in the SMTP server implementation of the googlemail mail servers (smtp.gmail.com, smtp.googlemail.com, ...). When sending an email over one of the SMTP servers of googlemail, the server immediately drops the connection when the client (YAM) signalled the server that it wants to quit the connection. However, the standard (RFC 2821) clearly defines that if a server receives such a QUIT command, it have to reply with a status code and afterwards drop the connection. Unfortunatley, the googlemail servers seems to not send this status code anymore if a mail was already successfully transfered. This of course, clearly violates the standard and causes YAM to drop an error/warning message about an unexpected connection drop.

Unfortunately, there doesn't exist any way of avoiding/supressing those warnings with YAM 2.4. However, recent versions (2.5) have an added workaround for the problem and doesn't automatically popup those warnings anymore.

Still, we highly suggest to send an email to the support of googlemail and let them know about the problem. Of course, feel free to cite this FAQ item in the hope that at one day googlemail developers will read it and fix their SMTP server implementation.

In addition to the above violation to the RFCs, the gmail servers seem to have a rather long timeout phase when communicating to SMTP clients like YAM. This means that upon sending an email it might happen that right at the end of the communication to the SMTP server of google, YAM returns an error because the gmail server didn't correctly response within the internally specified time interval within YAM. On the other hand it might be that this time interval was simply incorrectly set to a too short value. So please make sure (if you have YAM 2.5+ running) that your ".config" file has the "SocketTimeout" value right at the end of the file set to at least 30 or even higher which means that YAM will wait 30 seconds for a response from the mail server before considering the connection being broken/dropped.