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Postgresql connections refused because of too many connections

So I recently had a problem, where postgresql would run out of max concurrent connections .. and I wasn'T sure what caused it.

tryton with postgresql on another server & permissions

A little follow-up to my post about setting up tryton on Gentoo:

Dbmail quickly get mailbox counts (including deleted emails) [postgresql]

So while tracking down problems with performance with (webmail - ) clients I found out, that the problem is - at least partly - related to the sheer amount of IMAP folders (dbmail_mailboxes) a user had ( > 3500 !).