On Fri, Feb 03, 2012 at 08:04:31PM +0100, Reindl Harald wrote:

Am 03.02.2012 20:01, schrieb Stephen Harris:

...

In this, Les is correct. The RFCs merely say the HELO needs to _a_ valid identifier for the host. Indeed this discussion was on this list back in July ("SPAM on the List") where I pointed out that RFC 5321 says

i know the RFCs

does not change that it is a dmaned good idea this days to make matching A/PTR/HELO and it is EASY to do this

A & PTR, yes. HELO, no. It's not even possible to do HELO matching PTR when NAT gets in the way.