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.

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