Re: [exim] verify_sender

On Sun, 2010-05-16 at 11:02 +0100, Martin A. Brooks wrote:
> What's an RR?

The correct term for a Resource Record, ie. a primitive in a DNS zone.

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

No. An A RR is the proper name for an "A record", PTR RR "PTR record"
and so on.

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

No it isn't. An MX RR has a metric (weight) associated with it, as well
as name and data. An A RR has only name and data. Also of note is that
an MX RR cannot have an IP address in the data field (not that it stops
people putting them in).

Graeme