Mike Morris:
> Hi,
>
> I'm working on a mail server deployment that will only have one server
> for MX and SASL submission purposes. Generally I like to have separate
> Postfix instances to handle a specific task. In this case I'm running
> in to problems when the submission instance uses the same IP address as
> the MX instance. (Due to a limited IP address pool there is currently
> only one routable IP address assigned to this server.)
>
> Using the submission instance to send a message to a recipient address
> for which the server is also the MX host triggers Postfix' loop
> detection. Mail for foreign addresses is relayed correctly. I realize
> this can be done easily enough without using multiple instances. Is
> there a way to work around this so that an MX instance and submission
> instance can share single IP address? I've gotten used to the queue,
If you use different MTAs, then use different myhostname AND
different inet_interfaces settings. Otherwise it is just too easy
to screw up and have a high-speed mail system meltdown/explosion/etc.
Postfix is not just about "secure" for some vague definition of
secure, it is about making a safe to use, so that it does not rip
off your arms and legs when you make a trivial mistake.
Wietse
