Comments on: HOWTO: Setup SSL certificates for mail services (pop3s, imaps, smtps) on Plesk / Courier-Imap / Qmail

By: chirp.syxyz.net

chirp.syxyz.net — Tue, 14 Jul 2009 21:52:02 +0000

[...] lifted from here [...]

By: Dan

Dan — Thu, 02 Jul 2009 03:11:10 +0000

Plesk comes configured with a limit of 4 connections per IP address and a limit of 40 connections total. Modern IMAP clients such as Mozilla Thunderbird use mailbox caching to open up multiple connections to increase performance. In the case of Thunderbird, it opens up 5 connections by default which is already 1 connection more than Courier-IMAP’s default restriction. Add another few computers behind a firewall and those additional users won’t be able to connect at all since a single Thunderbird client is already utilizing all 4 connections.

http://kb.mediatemple.net/questions/259/(dv)+HOWTO%3A+Raise+Courier-IMAP+Connections

By: Dan

Dan — Thu, 02 Jul 2009 02:11:48 +0000

I found this seemed to make a difference:

Change the TLS_VERIFYPEER setting to “PEER”. The setting can also be changed to “REQUIREPEER” to require all SSL/TLS connections to provide a certificate. Otherwise, it is optional. If the mail client provides an SSL certificate, it may be used to authenticate. Without a certificate, password-based authentication remains an option.

http://www.courier-mta.org/imap/INSTALL.html

By: Eric Naujock

Eric Naujock — Tue, 17 Feb 2009 14:54:56 +0000

Thanks for the howto. I made getting our Plesk 8.4 system work great.

By: Denny

Denny — Wed, 16 Apr 2008 11:11:39 +0000

Thanks very much for the clear instructions – all went fine on my Plesk 8.3 server. :)

By: joshua

joshua — Sat, 01 Dec 2007 22:20:41 +0000

Hallo Justin

Thank you for your work and this site.
regards,
joshua

By: noman

noman — Thu, 29 Nov 2007 18:27:22 +0000

I did not get the pop3s and imaps part to work i get the following error, any suggestions:

CONNECTED(00000003)
write:errno=54

By: David

David — Mon, 20 Aug 2007 22:06:49 +0000

Thanks for the walk through that is a great help.

By: neo

neo — Mon, 12 Jun 2006 02:09:51 +0000

Hi :

About the pop3s for plesk, i was still not run ok!
do you have detail step can offer?

Thanks!
Neo