Re: [exim] verify_sender

On Sat, May 15, 2010 22:47, W B Hacker wrote:
> So your first line of defense is to check that the 'connectee' *server*
is legit
> - eg - has (a path to) proper published DNS entries. (PTR RR & A RR
for-sure, MX
> RR as well - hopefully)

What's an RR?

Assuming you mean "reverse record", surely a "PTR RR" is just an A record
and a "A RR" is actually just a PTR?

The concept of a "MX RR" is pointless, as an MX is just a special case of
an A record.