MX/A records; mail problems

2007-12-25 9:54:00

The original question was:

> I have an MX record for our domain in the DNS. However, I don't have

> A record for mydomain.com.

> Apparently, we can't get mail at mydomain.com sometimes from certain

> users.

> Would adding an A record would help? What would be the format, just

> "mydomain.com IN A address.of.mail.exchanger" ?

Unfortunately, there was no consensus. Some people said that if a mailer

can't recognize an MX record then it's broken. However, some people

suggested that I add an A record for mydomain.com in addition to an MX

record for mydomain.com will fix the problem for "brain dead mailers",

i.e.:

mydomain.com. IN A 12.13.14.15

The O'Reilly book on DNS (DNS and Bind, 2nd edition) implies that by

default most mailers will first look up the MX record for a particular

host, and then, if the lookup fails, will lookup an address for the host

itself, not the other way around.

Thanks to all that contributed, including:

Johnie Stafford, js@cctechnol.com

"Scott D. Yelich" <scott@spy.org>

"Schaffer, Gregory J." <GSchaffe@mc.utmck.edu>

"Mike D. Kail" <mdkail@fv.com>

Tom Lojewski <thl@atmsys.com>

"Auteria Wally Winzer Jr." <wally.winzer@ChampUSA.COM>

Thanks!

Dave.

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