Load Balancing with Postfix [and SpamAssassin]

Jordan Curzon curzonj at gmail.com
Wed Jan 18 18:18:12 MST 2006

I actually have a setup where multiple postfix servers receive mail
and then forward the mail to one of themselves where the mailbox sits.
All of the SMTP servers have some mail users on them. All of my
information is in LDAP, but you could use an RDBMS too.

On 1/18/06, Alan Fullmer <lists-alan at xnote.com> wrote:
> Greetings,
> I am wondering if anyone can direct me to any books/sites/etc regarding
> possibly running postfix on one or more servers accepting mail, processing
> with SA, then forwarding onto a 3rd machine.
> Currently my setup only includes one Postfix box, which does all of the mail
> filtering (with spamassassin) then forwards it on to a mailbox holding
> server.
> The setup works, however I get so backlogged.  For example, running a mailq
> as we speak, comes up with:
> 35918 Kbytes in 5257 Requests.
> It eventually gets through, and during the night it catches up.  I am seeing
> delays up to 3 hours sometimes.   I tail -f the maillog file and it's
> constantly running, so there is definitely activity.   Running top indicates
> 4 main processes with spamd indicating the slowdown is, indeed, with
> SpamAssassin.  I originally thought it might have something to do with the
> Bayes database, but for fun, I deleted it to see what would happen.  Same
> result.
> I am running a dual P3 1ghz machine currently and have plans to upgrade that
> to a dual xeon 3ghz.  However, I know this is only a temporary solution and
> at this point I'm not sure that it's enough.
> I get an enormous amount of mail coming into this machine and need to plan
> accordingly for future growth as well.
> So my goal is to possibly balance the incoming mail between two beefy
> machines to do the processing, hopefully accomplishing and eliminating this
> slow down.
> My question is any suggestions on a different way to do this?  Or are there
> suggestions on accomplishing a more balanced load between two machines.
> Any comments, helpful hints or suggestions would be more than welcome.
> Thanks,
> Alan Fullmer
> www.xnote.com
> www.zoobuh.com
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