Victor Duchovni:
> On Fri, Oct 03, 2008 at 09:09:56PM -0700, David Koski wrote:
>
> > Our CommuniGate server batches mail going out to Yahoo and at times
> > accumulates enough to exceed the limit of 5 messages per SMTP connection
> > that
> > Yahoo has and the connection is dropped. I would like to now if relaying
> > through Postfix can resolve this problem.
>
> You can disable connection caching, globally or for specific sites. Or you
> can let the connection be dropped and make a new one. Nothing wrong with
> a dropped connection from time to time... Postfix will try the next MX
> host. Postfix does not have a numerical connection re-use limit. Rather,
> the limit is a time-limit, because this exhibits (much) better behaviour
> when delivering to a mixture of fast and slow servers.
With Postfix 2.2 and later you could do:
/etc/postfix/main.cf:
smtp_connection_cache_destinations = !yahoo.com, static:all
However, this is not needed. When Yahoo drops a connection, Postfix
will just try the next MX host immediately.
Wietse
