On Fri, Feb 03, 2012 at 11:17:29PM +0100, Reindl Harald wrote:

Am 03.02.2012 22:58, schrieb Stephen Harris:

...

If your mail server talks to machine with IP address 1.2.3.4 then should it say HELO with the 10 address name or the 91 address name?

if you are not too stupid your internl view and external view of dns-names is identical and there is no difference

*boggle* What? Wow. No. Just no. That won't even work on a toy home network where your ISP sets the rDNS, it definitely won't work on a large corporate network. It only works in a trivial environment.

If you're telling me that my internal mail servers must talk to each other via the name pool-173-71-187-61.pitbpa.fios.verizon.net then... well, never mind.