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. -- rgds Stephen