Re: Supplying transport_maps with backup mailservers

On Tuesday, October 19, 2004 at 12:37 CEST,
"Riedel, Sven" <Sven.Riedel@f-it.de> wrote:

> I'm currently setting up a postfix host as a mailgateway for several
> other mailservers, most of which have backups in place.=20
>=20
> So far, I've added the relevant internal domains to the relay_domains
> list, and set up a transport_maps lookup table, so postfix knows which
> servers to relay to. So far everything is working, but I'd also like
> to make the backup servers known to postfix's transport maps.=20
>=20
> Using MX DNS records is not possible, as the internal mailservers are
> only visible on the inside network and the postfix box is on the
> outside part of the DNS divide.
>=20
> Is there any way to make the backup mailservers known to the transport
> maps? Going through the documentation, I've come up with a blank so
> far.

You can setup a local dummy DNS zone that contains the MX records you
need.

DNS zone:

example.com.invalid. MX 10 mx1.example.com.invalid.
MX 20 mx2.example.com.invalid.
mx1.example.com.invalid. A 10.0.0.1
mx2.example.com.invalid. A 10.0.0.2

Transport map:

example.com relay:example.com.invalid

--=20
Magnus B=E4ck
magnus@dsek.lth.se