Re: [qmailtoaster] Re: IMAP Folder SYNC issues after re-establishing Spamd and Clamd

Fri, 23 Apr 2010 09:39:26 -0700

Mike,
additionally I found this on the list from March 20, 2010 
In /var/qmail/supervise/imap4/run, modify tcpserver line to add the -c
 option as such:
 /usr/bin/tcpserver -c 60 -v -R -H -l $HOSTNAME 0 143 \
when I did this in addition to bumping up MAXSESSIONS I have not experienced the problem. Then stop qmail and start qmail.

Dave

On 4/22/2010 6:14 PM, Mike Canty wrote: 
Eric,
	Thank you for your input.

I was looking on the web yesterday and came across the following page
http://www.mail-archive.com/[email protected]/msg26685.html

This did lead me to check the number of running IMAP processes and it was
sitting at 43.  After killing these processes, the IMAP accounts worked
correctly, but the number steadily built until they got to over 40 again and
problem re-occurred.

I have increased the MAXSESSIONS in the /etc/courier/imapd file to 50, but I
think this is a stop gap measure.

I will investigate the Dovecot solution in the mean time.

By the way, I would like to thank yourself and Jake for the Toaster programs
and the follow up information/support.  I was a Qmailrocks user and this is
like a breath of fresh air. I now have installed Qmail Toaster in 4 sites
and looking to another 4 and it just keeps on getting better.

Cheers

-----Original Message-----
From: Eric Shubert [mailto:[email protected]] 
Sent: Friday, 23 April 2010 1:39 AM
To: [email protected]
Subject: [qmailtoaster] Re: IMAP Folder SYNC issues after re-establishing
Spamd and Clamd

Mike Canty wrote:
  
To All,
	For some time I have not been running Clamd or Spamd as part of my
simscan.  This was because of an unrelated issue, now resolved.

Recently I have returned these checking of messages using Clamd and Spamd,
see below.

/var/qmail/control/simcontrol
:clam=yes,spam=yes,spam_hits=12,attach=.mp3:.src:.bat:.pif

Since doing this our server is picking up more spam and virus related
messages, so everything is working.

My problem is, now the Sync of IMAP accounts fails quite regularly.  We
    
only
  
have about 20 IMAP accounts along with another 180 or POP accounts.

POP users are not seeing issues, just the Sync on IMAP.

Is there a way to see what is causing the issues?  Or is there a way to
"tweak" IMAP to improve the service?  The majority of my Toaster (CentOS
    
5)
  
install is as per Jake's Instructions. 

Cheers

Mike Canty



    
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I'm not getting a clear picture of what "the Sync of IMAP accounts fails 
quite regularly" entails. Which client program(s)? What is the client 
configuration (port, SSL/TLS)? What is the client error message, if any? 
What does the imap log(s) show?

That being said, courier should work fine with relatively small IMAP 
accounts. Do these accounts have any folders with a lot (thousands) of 
messages? Are the sessions timing out?

I normally don't like suggesting switching to something different when 
something doesn't work, but you should know that future versions of QMT 
will be using Dovecot instead of Courier. Many QMT users are already 
using Dovecot with great success. Dovecot performs significantly better 
with large IMAP accounts, and is very robust (it fixes things 
automatically that it find out of whack). You might want to consider 
giving Dovecot a try. I believe that there is a wiki how-to page for 
Dovecot that was added recently, and there are fairly recent posts about 
it in the list archives. I expect that your time would be better spent 
installing Dovecot than trying to fix what might be wrong with Courier. 
It's up to you though.
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