Ignoring MX records - how common
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Tue Feb 11 01:49:06 UTC 2003
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> Mark_Andrews at isc.org wrote:
> >
> > It will be SPAM unless one of your nameservers is returning
> > NODATA to MX requests. You have to have a negative answer
> > to the MX query before you make the A request. Nameserver
> > failure is *not* enough to cause fallback to A records.
>
> Mark, you're assuming things all follow the RFC's, my question
> is how many don't.
Why do you care? All such MTAs are BROKEN. The best thing
you can do with a broken MTA is to not accept mail from it.
The best way to do that is to not run a SMTP daemon unless
you are expecting to receive email.
People pandering to broken software results in the continued
use of broken software. This in no good for anyone.
> So far most stuff is spamware, but there are 2 distinct genuine
> servers doing this (since one belongs to a DNS consultancy you
> never know if their DNS is "fully debugged") to me.
Well you are doing them a disservice by accepting the email.
> I have found reports of Hotmail, and also IIS SMTPSVC doing this
> with form mail, but I can't confirm either as I don't regularly
> get mail to the domain in question from either of these sources.
> Beside if it claimed the sender was on hotmail I'd probably
> assume it was spam without double checking.
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--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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