[Mimedefang] OT: DNS sanity check

[Les Mikesell]

Jeff Rife wrote:
> 
> Configured not to be null...yes.  Configured so that reverse and 
> forward mappings match up...not nearly as often as you think.  For 
> example, mine would fail that test because I have an ISP that won't 
> change reverse DNS.

"Changing" isn't necessary for this test.  All that matters is that your 
ISP supplies a forward lookup in their own domain to match whatever name 
they give the reverse lookup.  That's why it is pretty much irrelevant 
to what your hosts might be doing on the address.

-- 
   Les Mikesell
    lesmikesell at gmail.com