> OT, and possibly already discussed --

It's not OT at all--it's an IMail feature!

> We've  got our systems set up as a peer-group and have established a
> sinlge ip address to allow relays from.

Don't  get  what  you  mean here. Peering and relaying are essentially
unrelated,  or,  in  some  configurations,  mutually exclusive. A peer
group  is  designed to share the same recipient domain across multiple
physical  servers  for  incoming  mail.  SMTP sending to other domains
should  occur through a different logical network, that is, you should
not  attempt to use incoming peering and outgoing smart hosting on the
same  network.  Smart  hosting  creates  a  hierarchy, while peers are
theoretically  non-hierarchical.  On the other hand, peers can be used
as  independent outbound relays by their authenticated users; or, in a
more  ideal,  scaleable  setup, your mailbox servers are never used as
the  triage  point  (mailhub)  for local-vs.-remote mail, as a farm of
non-mailbox MTAs are used for this function.

You say you have established a single IP address to allow relays from;
does  this  mean that you have separate outgoing MTAs, but are pooling
outgoing  traffic  through  one  of  your  peers before sending to the
outbound  farm?  This  is very unclear...don't see where a server farm
and a single IP are coinciding.

Give  us a more complete description of the network--include IPs, peer
config  on  each  box,  relay  perms  on  each box. There are too many
variables for us to guess at.

-Sandy


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