Peter Wienemann via Postfix-users:
> Dear Postfix experts,
>
> checking the documentation for the relayhost parameter [0] I find no
> indication how Postfix behaves in case of multiple relay hosts with
> multiple DNS entries. Let us assume the following setting:
for each destination d in relayhost:
try to deliver the remaining recipients to destination d
if no recipients remain, stop.
defer any remaining recipients
Perhaps surprisingly, Postfix delivers mail to "destination d" for
all supported forms of "d", whether that is a domain name, [hostname],
[ipaddress], and with or without an explicit :port.
Wietse
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