View source for Outgoing Mail Problems

== Modifying the relay networks ==
If you want to allow additional hosts or networks to send email through your MTA, you add them to the allowed relay list.  ''Be careful'', misconfiguration of this can allow malicious outsiders to send spam through your system.
=== Getting the existing value ===
Run these commands on your MTA server:
  su - zimbra
  zmprov gs `zmhostname` | grep zimbraMtaMyNetworks

If nothing is returned, you're using the postfix default - fetch that with:
  su - zimbra
  postconf -d mynetworks

=== Setting the new value ===
To add hosts, you'll need to add to the existing value you just fetched:
  su - zimbra
  zmprov ms `zmhostname` zimbraMtaMyNetworks "127.0.0.0/8 10.1.0.0/16 a.b.c.0/24 w.x.y.z/32"


The quotes above are important.

Restart the services when done.