Problems with Mail Server (IMAP) (Plesk 11.5.30#31)

[Fritz MichaelG]

Solved: Problems with Mail Server (IMAP) (Plesk 11.5.30#31)

I have some odd problems with the IMAP Mail Server when using Thunderbird. The Inbox of each mail account can (usually) load without any problems. However, when I try to open one of the Subfolders, e.g. Sent, Drafts, etc., Thunderbird is unable to load the mails. It just says "Connected to mail.domain.com..." indefinitely. No error message or anything pops up. Even the Error Console (Ctrl-Shift-J), does not show any error message, ever.

When I restart Thunderbird I am able to load one subfolder (but not of each mail account on the same domain), for one time, but then it stops working again. Other Mail Apps seem to be working fine, although sometimes the Android Mail App reported an "internal error" when accessing a folder.

I have no idea how to tackle this problem. I hope someone can give me some advice here.

 

[Fritz MichaelG]

Found this article and thought this could be the problem: http://www.thesupportsystem.co.uk/2...m-number-of-connections-to-this-server-linux/
And it seems to have fixed it. I increased MAXPERIP to 40 and MAXDAEMONS to 80 and now Thunderbird is always instantly able to connect to any of the folders. I assume Thunderbird uses multiple connections to the same server and does not close them immediately.