Comments on: Add more Courier-IMAP connections under Plesk

By: Kai

Kai — Sat, 17 Sep 2011 20:07:56 +0000

Thank you thank you thank you! I had the very same problem with courier and Plesk and you saved my day / night.

By: ffab

ffab — Mon, 17 Jan 2011 15:48:31 +0000

great article ! saved me a lot of headache

By: TK

TK — Mon, 08 Nov 2010 16:45:45 +0000

I’ve just solved a similar issue, only with regards to POP mail.

I have a dedicated server running Plesk 9.5 and when I upgraded to iLife 11 and Snow Leopard this error appeared. I could quickly click “get mail” and I’d get all my mail, but only 3-4 of my 9 mail accounts would connect. Theo others would have the error:

“The server error encountered was: The attempt to read data from the server…”

I found solutions for those using IMAP mail here in this thread:

modify the /etc/courier-imap/imapd configuration file and change MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40. This allows all the machines behind my home firewall to connect to multiple accounts on the e-mail server with mailbox caching enabled.

I’d made this change on my server but it didn’t seem to have any effect. It dawned on me that I’m using POP, not IMAP. So I found in /etc/courier-imap/pop3d the same settings. I changed the MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40 and voila, all my connections concurrently worked.

This has taken me more than two days to fix and I hope posting this helps someone else with the same issue.

By: IMAP connections limit fix | tim tucker dot org

IMAP connections limit fix | tim tucker dot org — Sat, 17 Apr 2010 13:16:47 +0000

[...] I didn’t really buy this answer. I did some more searching and finally hit on this link. It explains how to increase the IMAP connection limit to allow more connections from the same IP [...]

By: PokerMundo - Directorio de Poker Español

PokerMundo - Directorio de Poker Español — Tue, 30 Mar 2010 10:06:17 +0000

Our Gambling server has only 2 GB of memory. We have around 100 websites and every website has her own email… and some webs have many email so I changed it to 200 but i am worried about the increase of resources. I experience many problems with thunderbird, i changed each account to 1 cached connection but the problem continued.

Thanks for the post, I will test and review here in some days… when tested the new config.

By: Claudio

Claudio — Mon, 15 Mar 2010 20:49:10 +0000

I have the same problem with my ISP that using Plesk, I ask him to set more connections, now he said that he can’t set more than this but I have some problem already.
Can I limit the connections from my IMAP client, that is Mail on Mac OS X 10.6?

By: Plesk & Mailserver : Maximale IP Verbindungen hochsetzen | Stefan Pausch

Mon, 01 Feb 2010 13:21:35 +0000

[...] Google und joelmama.com stiess ich auf inertramblings.com auf dessen die Lösung für mein Problem [...]

By: Sven

Sven — Sun, 24 Jan 2010 00:32:02 +0000

Thanks a lot for this very helpful informations!

By: Jon

Jon — Wed, 30 Dec 2009 11:22:10 +0000

That’s saved me a right headache! Cheers for this!

By: Johan van Wilsum

Johan van Wilsum — Sun, 20 Sep 2009 06:35:35 +0000

Yeah a solution!!! Thanks dude!