From: Colin Campbell (sgcccdccitec.qld.gov.au)
Date: Tue Mar 04 2008 - 19:25:49 CST

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Hi,

I have a setup as follows:

Host A: running Exchange, handles email for example.com. Some users are
local and some are "remote". Users that aren't local are sent to Host B.

Host B: running Postfix, rewrites (virtual_alias_maps) example.com to
example.net and uses Host C as relay host.

Host C: receives email from Host B and forwards to mail server for
example.net

My question relates to the following scenario:

Suppose user1example.com sends an email to user2example.com, "user2"
being one of the "remote" users. The email is forwarded from Host A to
Host B. Host B then rewrites user2example.com to user2example.net and
tries to send to Host C. Unfortunately host C is down, the email is
delayed and Postfix sends a delay notification.

Will the delay notification be subject to the virtual_alias_maps
rewrite? (ie will user1example.com be rewritten to user1example.net).
If so, what's the best method of stopping this? All suggestions welcome.

I guess I should also ask if virtual_alias_map is the best way to handle
this. Is it?

Colin
--
Colin Campbell
Unix Support/Postmaster/Hostmaster
Citec
+61 7 3227 6334

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