Blake:
> I have a relay server which is doing great relaying email except a 
> specific domain.  Instead of pointing to the new google aspmx servers it 
> is going to an old postini.  I have made a request that the MX record be 
> updated but due to vacations of the individual in control it could be 
> mid to late next week before this change is made.  For the short term I 
> would like to explicitly forward that one domain instead of setting the 
> relay server to send all mail one direction.

The Postfix "transport_maps" feature takes precedence over
"relayhost".

/etc/postfix/main.cf:
   # All mail to google aspmx, except domains specified in transport_maps.
   relayhost = ...google aspmx server...
   transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport:
   example.com  smtp:...postini server...

Use "postmap /etc/postfix/transport" after editing the file.

http://www.postfix.org/transport.5.html
http://www.postfix.org/postconf.5.html#transport_maps

        Wietse

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