[ale] Anyone have experience hosting email for multiple domains?

[Matt Rideout]

Postfix and Dovecot are both good choices. In the past, I've setup 
Postfix and Dovecot using the docs on their sites. Glancing over the 
CentOS doc, it looks like it'll at least get you moving in the right 
direction. IMO, there's no need to bother with virtual users until you 
have a vanilla setup functional, and are comfortable with it. Once you 
have that going, dig into Virtual Users. A few random pointers:

1. yum is your friend.
2. Don't be tempted to stray towards sendmail unless you have a very 
good reasons. It's a PITA.
3. Make sure that sendmail is fully shutdown, and disabled before you 
try to get Postfix working.
4. Test to make sure you don't have an open relay going each time you 
make a configuration change.
5. Make sure that you have reverse DNS properly setup for your mail 
server's IP.
6. Make sure that your mail server's IP isn't on any major blacklists 
before going live.

Richard Bronosky wrote, On 08/31/2009 12:07 AM:
> I'd like to avoid reliving your horror stories. I'm a big fan of
> "learn from the mistakes of other, don't make them yourself." So far I
> have installed postfix and dovecot on a CentOS 5.3 slicehost slice.
> Here are my needs (which I will compromise on if I must):
> 1. Forward email for at least 8 domains to other services (mostly Gmail).
> 2. Act as a secure sendmail server so that Gmail will send _from_ my
> domain, not _on behalf of_ my domain.
> 3. Act as 'final destination' for at least 1 domain.
> 4. Server IMAP for final destination domain[s].
>
> So, any advice, good reads, etc.? I have worked through
> http://wiki.centos.org/HowTos/postfix and am going through
> http://www.postfix.org/VIRTUAL_README.html I haven't started with
> http://wiki.dovecot.org/VirtualUsers so I don't know if I need that
> yet.
>
>