mouse@Rodents.Montreal.QC.CA (der Mouse) writes:
> > [...]  If a host can send E-mail, it must have at least an MX record
> > in the public DNS.
> 
> Where did you get that?  It's the first I've heard of any such
> restriction.

It is a pretty common practice to not except mail from someone that
doesn't have either an A or MX record for the claimed
hostname/domainname.

Folks are of course free to accept mail with any envelope-from they
want, but in the age of spam it isn't done across the board like it
once was.  Times change.

-wolfgang
-- 
Wolfgang S. Rupprecht 		     http://www.wsrcc.com/wolfgang/