[afnog] SMTP server rejecting domain

[Stephane Bortzmeyer]

On Fri, Jun 02, 2006 at 02:06:10PM +0200,
 Mangaliso Jere <mangaliso at gmail.com> wrote 
 a message of 46 lines which said:

> Jun  1 13:24:46 nyandeni sendmail[12526]: k51BOegj012526:
> ruleset=check_mail, arg1=<asmwale at cedrisa.org>, relay=[196.45.190.62],
> reject=451 4.1.8 Domain of sender address asmwale at cedrisa.org does not
> resolve

Indeed:

% check_soa cedrisa.org 
chambo.sdnp.org.mw is not authoritative for cedrisa.org
There was no response from domwe.leland-mw.org

What is your question, exactly? How to fix the domain (they should) or
how to make Postfix accept a broken domain (you should not)?