1 message in net.sourceforge.lists.courier-usersRe: [courier-users] Broken MX records.
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Michael S. FischerJun 20, 2000 8:22 pm 
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Subject:Re: [courier-users] Broken MX records.Actions...
From:Michael S. Fischer (mich@dynamine.net)
Date:Jun 20, 2000 8:22:05 pm
List:net.sourceforge.lists.courier-users

On Tue, 20 Jun 2000, Sam Varshavchik wrote:

<sigh> Look at this:

;; QUERY SECTION: ;; mail.flashmail.com, type = MX, class = IN

;; ANSWER SECTION: mail.flashmail.com. 25m29s IN CNAME flash1.flashmail.com. flash1.flashmail.com. 25m29s IN MX 10 mail.flashmail.com.

Currently, the DNS resolver gets confused by such nonsense, and refuses to deliver to @mail.flashmail.com (@flashmail.com is still deliverable, though).

I've made a patch to properly resolve such silliness, but I'm wondering whether someone so clueless deserves to have his mail bounce anyway...

IIRC MXes that point to CNAMEs are clearly illegal per the relevant RFCs and even BIND 4.9 staunchly refuses to publish master maps that contain these.

Any idea how this even made it into the zone maps? Must be a _really old_ version of bind or maybe it's an NT box or something.

--Michael