Creating a "mail gateway"

[Jamon Camisso]

Robert Brockway wrote:
> On Tue, 17 Jun 2008, Ian Petersen wrote:
> 
>> Regarding postgrey, he's got some kind of spam filter in place.  Don't
>> know anything about it except that it integrates with Exchange.  As
>> for receiving mail when Rogers is down, won't the sending MTA queue
>> things just as well as Postfix could?
> 
> Yes, but[1], you have no control over how long the remote MTA will queue 
> the mail whereas you can control how long your MTA queues mail.
> 
> Mail bounced by a remote MTA is silent to you too - you don't ever know 
> someone tried to email you.  Even if you MTA was forced to start 
> rejecting mail (disk full or whatever) you have logs of the event 
> (unless that filesystem was full too of course).
> 
> IMHO email is too important to business these days to trust remote MTAs 
> to queue the mail and deliver it in some rational manner following an 
> outage.

Yep, use relay_domains to have a postfix instance on another server 
queue mail for later delivery to your primary mail server in the event 
of a (primary) mailserver outage:

http://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup

Should be easy enough to have postgrey work on both MX hosts too.

Jamon
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