Hello,
According to Section 6.4 of RFC 5321:
"The following changes to a message being processed MAY be applied
when necessary by an originating SMTP server, or one used as the
target of SMTP as an initial posting (message submission) protocol:
o Addition of a message-id field when none appears
o Addition of a date, time, or time zone when none appears
o Correction of addresses to proper FQDN format"
The first case where a message-id is added hasn't been reported as a
problem. We are aware of problems (third case) when addresses are rewritten.
I haven't come across the second case yet (
http://chilli.nosignal.org/mailman/private/mailop/2010-June/002511.html
) where Yahoo injects the following Received header:
Received: from [12.157.195.83] by web112620.mail.gq1.yahoo.com via HTTP;
Tue, 29 Jun 2010 08:01:08 PDT
A timezone is being added:
Received: from [12.157.195.83] by web112620.mail.gq1.yahoo.com via HTTP;
Tue, 29 Jun 2010 08:01:08 -0700 (PDT)
Regards,
-sm
Received on Tue Jun 29 2010 - 21:58:49 PST