Re: MS DNS Mail routing problem

David Payer ( (no email) )
Thu, 20 Aug 1998 04:38:55 -0500

Subject: MS DNS Mail routing problem

+AD4-To all on the list,
+AD4- We have been running MS DNS for over 6 months now with no problem. Just
+AD4-recently I have noticed a problem with some domains for e-mail not being
+AD4-found, then bounced back. At first I thought it was operator error, then
+AD4-after doing my own testing, I found that it was not. The domain,, when looked up by my server says this...
+AD4APg- +AFs-MX IN+AF0-
I mentioned this several weeks ago. This is a bug known to MS. The error
occurs when a UNIX system does not put in an MX record for their machine.
The RFC says if there is no MX record, use the A record of the address it is
directed to. The MS DNS does not do this.

I have since then pointed my mail servers to my upstream providers
resolvers. This is a fundamental flaw in my estimation. I think they would
have jumped on it with a solution but alas.

David Payer
OMNI Internet