I have dovecot 1.0alpha1 setup in a semi test environment running on Solaris 2.6.

When using Thunderbird 1.0.6 from Windows occasionally the client will hang after sending a message and before copying it to the Sent folder on dovecot. Sendmail logs indicate that the message has been sent correctly.

The mail directory is not shared over NFS. It is in maildir format.

Restarting Thunderbird and sending exactly the same message will work. This seems to imply that it is not message dependant. Once the error has occured once it continues to occur until the client is restarted.

We have file system quotas however they are very large for a very small amount of mail. The filesystem is about 80% free space and about 98% free inodes.

I cannot replicate the issue under Linux using Thunderbird that is current for FC3. Some hacked version 1.0.2-1.3.3

Imap workarounds turned on under dovecot are outlook-idle for imap. The issue has not been seen under Outlook. Outlook is using a local Sent-Items folder instead of an Imap one however.

The connection is running over SSL so I can not sniff the traffic on the wire, I have not tried using the rawlog settings yet. I plan to start this now, however the sporadic nature of the problem may delay useful information from here.

The dovecot logs are not showing error messages, just: dovecot: Sep 09 09:24:35 Info: imap-login: Login: user=.... TLS

Any suggestions on where to start would be great. This issue was not reported to me when running dovecot-1.0-stable-20050718.

Thanks for any help/suggestions on where to go from here.

-- Nich