Could Be OT: How many people only accept reverse DNS lookup mail?

[Ed Bruce]

Billy A. Pumphrey wrote:
> Does anyone only accept email that will do a reverse lookup?  Does
> anyone recommend it?
>
> Thank you
>   
I had this on for awhile, using Postfix, and turned it off. Many of our
most important customers have mis-configured MTAs (Exchange of course)
using their internal name (always something like
exchange.clueless.local). I only use reject invalid and non-FQDN on HELO
and unknown sender domains (they need at least a valid domain in their
reply to address).