MX Records

[2U]

well, normally, if mx exists and there's no A record for a domain, the
mx works. but in some cases, (probably NT) cannot recognize this. Error
"sender domain must resolve" may be given.  we tried this, after we
added an A record for the domain, it runs smoothly then.  

Barry Margolin wrote:
> 
> In article <Twdy3.3114$iy.54777 at newsr1.san.rr.com>,
> Barry Trottier <btrotti1 at san.rr.com> wrote:
> >Why are MX Records needed?
> >
> >Can your site not receive mail without them?
> 
> You should be able to receive mail without them.  They're only really
> needed if the mail server has a different address from the domain name
> itself.
> 
> However, there are efficiency reasons, having to do with the way caching
> DNS servers work, why it's a good idea to have an MX record even if it just
> points to itself.
> 
> >Also, how can they be set up if you only have 1 IP address for your computer
> >+ site (ie the IP of the computer is the IP of the site).  It seemed by
> >reading info on MX Records that they sent mail to a machine and it seemed
> >that the machine needed to be an 'A' record and therefore have a different
> >IP from the actual mysite.com IP.
> 
> As someone else pointed out, there's nothing wrong with having the MX
> record point back to the same name.
> 
> --
> Barry Margolin, barmar at bbnplanet.com
> GTE Internetworking, Powered by BBN, Burlington, MA
> *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
> Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.