[Mimedefang] Comparing relay IP and dns name

[Jim McCullars]

On 4 Aug 2004, Mark Wiater wrote:

> I'm currently only logging those to syslog but I wanted to ask you all
> what you think of the validity of at least tempfailing a connection from
> such a relay?

   I used to do something similar, but BellSouth and Knology now sell
business DSL, but they don't bother to create PTR records so while
mail.foo.com might resolve to www.xxx.yyy.zzz, www.xxx.yyy.zzz still
resolves to user-www-xxx-yyy-zzz.hsv.bellsouth.net so I had to stop that.

Jim McCullars
University of Alabama in Huntsville