[Mimedefang] OT: DNS sanity check

[John Rudd]

Les Mikesell wrote:

> You can support a claim that it is a recommended best practice to
> provide matching A and ptr records in your DNS.  It is beyond stretching
> things to claim that refusing email is a best practice.
> 

You're like talking to a brick wall.

Your counter-assertion against this behavior is completely unfounded.
There is nothing that says you MUST NOT nor SHOULD NOT reject based upon
the sender's bad DNS (the only prohibition that comes close is based
upon the sender's bad HELO).  A sender who doesn't have matching A and
PTR records is violating best practices.  It is perfectly reasonable to
reject a sender's email when you know they're violating best practices.