Re: inet_interfaces for outbound smtp traffic

Wietse Venema (wietseporcupine.org)
Sun, 28 Nov 1999 12:36:46 -0500 (EST)

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a8505970unet.univie.ac.at:
> Hi,
>
> found the "inet_interfaces" parameter to specify the interfaces to receive
> e-mail on. But how do I tell postfix (in particular, the smtp program of
> postfix) which interface to use for outgoing smtp traffic? I'd like to use
> a virtual IP both for incoming and outgoing traffic. So far postfix always
> uses the canonical IP for outgoing traffic.

If inet_interfaces specifies one interface (*), then Postfix will
use that interface for sending and receiving mail.

If inet_interfaces specifies multiple interfaces, then Postfix
leaves it up to the operating system to pick a suitable source IP
address for sending mail.

        Wietse

(*) and if that interface is not the loopback interface

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