From: Wietse Venema (wietseporcupine.org)
Date: Fri Oct 22 2010 - 18:58:32 CDT

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> relay_domains = [ws.arlut.utexas.edu] [sisl-list.arlut.utexas.edu] [spd.arlut.utexas.edu] [lists.arlut.utexas.edu] [seaturtle.arlut.utexas.edu] [arlex.arlut.utexas.edu] [arlmail.arlut.utexas.edu] [tools.arlut.utexas.edu] [vme.arlut.utexas.edu]

As mentioned by Noel, relay_domains must not have []. The [] are
not supported here by Postfix documentation.

> relayhost = ns4.arlut.utexas.edu

As mentioned by Noel, this needs [] to avoid MX lookups (the MX
hosts for ns4.arlut.utexas.edu are mxhost2.arlut.utexas.edu
and mxhost1.arlut.utexas.edu.). The [] are recommended by
Postfix documentation when you want to relay to a hostname.

        Wietse

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