Sender domain must resolve problem

[Igmar Palsenberg]

> >>> MAIL From:<rjd at rtds.com> SIZE=7931
> 451 <rjd at rtds.com>... Sender domain must resolve

nslookup rtds.com doesn't resolve. Sendmail requires it (actually, the map
classes do)

Add a 

rtds.com.		A	xxx.xxx.xxx.xxx to your DNS.


> If I understand this correctly it's saying that the mailexchanger for
> the techexpo.com domain is mail.techexpo.com and that the first
> nameserver for that domain is NAMESERVER.CONCENTRIC.NET. When I use the
> server command of nslookup to log into their nameserver and then query
> their nameserver for the rtds.com domain it has records for it. What I
> don't understand is that if their nameserver has records for the
> rtds.com domain then why does sendmail on mail.techexpo.com reject the
> message? I must be missing a step somewhere, or perhaps it's just a
> sendmail configuration problem at mail.techexpo.com?

It's the spam filter that hates these kind of setups.



	Igmar