Victor Duchovni:
> On Fri, Jun 18, 2010 at 11:41:46AM -0400, Wietse Venema wrote:
>
> > > This is robust and easy to document. The work-arounds I posted
> > > also work, but are less elegant and should be avoided. If the
> > > OP wants to use them, fine, he is fully informed...
> >
> > I recommend a different myhostname per "port 25" instance. The
> > Postfix SMTP client verifies the HELO response and will declare a
> > loop when the best MX host replies to HELO with the client's own
> > myhostname.
>
> Sure, but when the destination IP address is listed in inet_interfaces,
> the connection is not even made and a loop is detected. Hostname tweaks
> don't help in this case, the idea is to not forward to your own port
> 25, where "your own" means an IP address that is listed in instance's
> "inet_interfaces".
Even if you have different IP addresses, Postfix will declare a
loop when the server responds with myhostname to HELO.
Therefore a different myhostname is NECESSARY but not sufficient.
Wietse
