Wietse Venema via Postfix-users:
> 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}
The same using sender_dependent_relayhost_maps:
/etc/postfix/main.cf:
sender_dependent_relayhost_maps =
# Put real sender-dependent lookup tables before
# the randmap hack.
randmap:{[host1]:port1, [host2]:port2}
Wietse
Wietse
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