On 7/18/11 5:43 AM, Stephen Harris wrote:
On Sun, Jul 17, 2011 at 10:12:16PM -0500, Les Mikesell wrote:
On 7/17/11 9:37 PM, Stephen Harris wrote:
On Sun, Jul 17, 2011 at 09:07:38PM -0500, Les Mikesell wrote:
There is no requirement for the greeting name to match any IP, and isn't likely
RFC2821 says: - The domain name given in the EHLO command MUST BE either a primary host name (a domain name that resolves to an A RR) or, if the host has no name, an address literal as described in section 4.1.1.1.
So, pretty much, HELO or EHLO greeting _must_ match to an IP.
(RFC821 actually wanted the HELO to match the connecting host, but 2821 just says it must be an A record or an address literal).
That's a long way for saying it MUST be the name of that particular host (which
I addessed that in the parenthetical; 821 did require it; 2821 doesn't.
Can you point me to the section? I don't see anything there about the hostname having to match an interface address or being allowed to reject if it isn't - or even any advice on how clustered hosts representing one mail domain should represent themselves.