Mark Constable writes:
I was using ISPConfig3 + postfix for the past year and finally got around to unhitching myself from ISPConfig3 so I could run courier again on this particular server. However since the changeover I've noticed that Thunderbird seems to just "hang" and wait every half a dozen'th time when I go to check my mail. I don't recall this happening with Dovecot.Is it possible there is a MAXPERC setting missing like in esmptd?
Leaving off MAXPERC should not be a factor. It defaults to, internally, to MAXDAEMONS – effectively a no-op.
So, that can be pretty much eliminated as a suspect. I presume that you've eliminated the low hanging fruit of actually reaching the maximum number of connections.
Additionally, it's been my experience that Thunderbird will report a new connection getting closed, and tell you to dial down an advanced setting for the maximum number of simultaneous connections. When MAXPERIP or MAXPERC is reached, the connection gets accepted and dropped, and Thunderbird will 'fess up, and play stupid.
Once MAXDAEMONS is reached, though, couriertcpd stops accepting connections altogether. That would certainly result in a connection hang, until one existing connection gets disconnected. That would square with your symptoms, as well as anything else that might cause a hang after a connection is established; say you're using LDAP or MySQL as an authentication back-end, and the password validation query gets stalled, for some reason.
Those are the kinds of things to look at, here.
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