On Thu, Jun 18, 2009 at 08:28:12AM -0400, Wietse Venema wrote: > With Postfix, the format is: > > Received: from HELO (FCRDNS [IPADDR]) ... > > According to RFC 5321 section 4.4:
Which matches the second form in each case of Extended-Domain and TCP-Info. Odd that they appear to be standardizing some comment elements of a header, ... Time-stamp-line = "Received:" FWS Stamp <CRLF> Stamp = From-domain By-domain Opt-info [CFWS] ";" FWS date-time ; where "date-time" is as defined in RFC 5322 [4] ; but the "obs-" forms, especially two-digit ; years, are prohibited in SMTP and MUST NOT be used. From-domain = "FROM" FWS Extended-Domain By-domain = CFWS "BY" FWS Extended-Domain Extended-Domain = Domain / ( Domain FWS "(" TCP-info ")" ) / ( address-literal FWS "(" TCP-info ")" ) TCP-info = address-literal / ( Domain FWS address-literal ) ; Information derived by server from TCP connection ; not client EHLO. -- Viktor. Disclaimer: off-list followups get on-list replies or get ignored. Please do not ignore the "Reply-To" header. To unsubscribe from the postfix-users list, visit http://www.postfix.org/lists.html or click the link below: <mailto:majord...@postfix.org?body=unsubscribe%20postfix-users> If my response solves your problem, the best way to thank me is to not send an "it worked, thanks" follow-up. If you must respond, please put "It worked, thanks" in the "Subject" so I can delete these quickly.