[CentOS] Mail server setup for small ISP

Ralph Angenendt ra+centos at br-online.de
Fri Jan 4 09:44:57 UTC 2008


Gary Richardson wrote:
> It's been awhile since I looked into it, but I recommend outsourcing your
> email.

Erks. I wonder why *anyone* in his sane mind would do so (okay, here it
is smallish ISP but I - as a customer - trust my ISP to handle my mail
and would get another ISP as soon as I knew that it is outsourcing mail).

>>        For mail server, I guess I should look at an MTA and IMAP/POP
>> server
>> that supports LDAP and/or MySQL for users.  Postfix should be a good
>> choice for MTA, as I know it (at least a little, but I know sendmail
>> better).  

Then why not use sendmail? Once it is configured properly, maintaining
users is the same as with other MTAs.

>> For IMAP/POP, I'm not sure...  Would dovecot be sufficient, or
>> should I try cyrus.  I'd rather use components that are available for
>> base or extras repository (or rpmforge).  I think that squirrelmail and
>> horde would do a good job for webmail.

I've heard that dovecot scales pretty good. If you want to be on the
safe side, cyrus probably scales way beyond what you need, but is also
harder to maintain.

>>        There shoudn't be any troubles having some redundancy for DNS, web
>> servers, mtas, but what about IMAP/POP?

If you're already thinking about drbd - why not share the imap store
also? And: There still is the Cyrus Murder for bigger setups, which
allows for flexibility within IMAP frontend and backend servers.

>>           Or maybe IMAP proxies?

See <http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/CyrusCluster>
which should answer most of your questions regarding HA within an imap
setup.

Cheers,

Ralph
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