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Courier setup for over 17.000 Users [was: Mail clustering]



Hello Marek,

I have nearly the same problem...

Am 2007-03-20 16:27:36, schrieb Marek Podmaka:
> First you should identify what is your bottleneck. Is it postfix? I

I use "courier-mta-ssl"

> don't think so, because receiving+storing emails use very little
> resources (maybe something for regexp checks and bandwidth/latency for
> RBLs). IMAP/POP3 can use some disk + CPU for sorting emails. But

Heavily if $USER have over 10.000 messages in one Folder...

> usually the bottleneck is antivirus/antispam. So until you get disk

Right

> bottleneck I think one server for smtp + pop3/imap is enough and you

And there is the problem!

I have configured ONE inbound "courier-mta-ssl" and curently FIVE
"courier-imap-ssl" since I have too much $USER accessing the IMAP
at the same time.  Arround 600-1400 $USER of over 17.000 Accounts
but increasing.

The mailboxes itself are on 5 seperated NFS-Servers.

I have setup a round robin for <mail.mydomain.tld> for the IMAP
Servers but it does not realy work, specialy if $USER use the
Webinterface on <webmail.mydomain.tld> which use 2 Servers currently.

Any hints how to setup correctly round robin for:

  1)  <webmail.mydomain.tld>
      The 2 Webmail (I use my own PHP5-Apache interface and
      not sqwebmail, since it does not work HOW I like)

  2)  <mail.mydomain.tld>
      The 5 IMAP servers

  3)  <smtp.mydomain.tld>
      The InBound "courier-mta-ssl" which do currently SPAM-
      Filtering too since I do not know HOW to setup this on
      external Servers...  I like to set up this server for
      SMTP-Level filtering only and then use external Servers
      for Virus and other SPAM filtering.

Thanks, Greetings and nice Day
    Michelle Konzack
    Systemadministrator
    Tamay Dogan Network
    Debian GNU/Linux Consultant


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