spam filter and MX records

Barry Margolin barmar at
Thu Feb 2 04:33:48 UTC 2006

In article <drpg0t$2jki$1 at>,
 Merton Campbell Crockett <m.c.crockett at> wrote:

> There are also broken mail systems.  They will deliver mail to the A  
> record.

Can you name one?

I know there's a configuration option in sendmail to make it use the A 
record ONLY if the best MX record points to the current server, and the 
domain isn't in its local-delivery list.  This is mainly useful if you 
run sendmail on your firewall, but don't use split-DNS -- outside 
systems use the MX record to get to the firewall, and then it use the A 

Barry Margolin, barmar at
Arlington, MA
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