Sendmail help

[Martin Schröder]

Hi,
if this a FAQ, a pointer is welcome.

I'm trying to get a machine w.x.y.z behind a NATting 3.9 fw with
dyndns to receive from outside (sending is already possible).

Idea: The fw has a dyndns a.b.c.d with mx pointing to another dynds
b.c.d.e for the same machine, so the mail reaches the fw.

How do I tell the sendmail on the fw to send mail it receives for
a.b.c.d to w.x.y.z? After entering a.b.c.d into
/etc/mail/relay-domains it accepts the mail, but then tries the mx for
a.b.c.d, which is not very helpfull (since it points to itself). An
entry in /etc/hosts exists pointing a.b.c.d to w.x.y.z

Thanks in advance
   Martin