On Mon, Feb 13, 2012 at 05:17:42PM +0000, Alex Bligh wrote: > >I wasn't aware of that. Maybe I'll examine the RFC more closely and > >see if that is specifically allowed. > > I'll save you the trouble - it is not allowed. > > RFC 2821 p51
RFC 2821 covers (surprise!) SMTP, so the Received format documented there is only for SMTP hops. For non-SMTP transactions, the looser interpretation of 2822/5322 applies. https://tools.ietf.org/html/rfc5322#section-3.6.7 > Received: by english-breakfast.cloud9.net (Postfix, from userid 54) > id 55AD5C9E23; Wed, 30 Jul 2008 13:26:28 -0400 (EDT) This is a non-SMTP hop. -- Viktor.