Stephan Seitz via Postfix-users:
> Hello!
>
> According to the manpage relayhost can have more than one host.
>
> If you have more than one, how is the host chosen? Always the first
> until it fails? Or always randomly?
In the specified order. Using multiple relayhosts is rare, using
them randomly even rarer.
> Can I configure Postfix to use the relay hosts randomly?
Perhaps you can mis-use sender_dependent_default_transport_maps:
/etc/postfix/main.cf:
sender_dependent_default_transport_maps =
# Put real sender-dependent lookup tables before
# the randmap hack.
randmap:{smtp:[host1]:port1, smtp:[host2]:port2}
If you need a weighted distribution use something like:
/etc/postfix/main.cf:
sender_dependent_default_transport_maps =
# Put real sender-dependent lookup tables before
# the randmap hack.
randmap:{smtp:[host1]:port1, smtp:[host1]:port1, smtp:[host2]:port2}
Wietse
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