My recollection is that in June, Microsoft anounced they would require
Sender ID (not SPF) at msn.com and hotmail.com.
The Sender ID extends SPF to include the From: header, which in the
case of mailing lists does not work very well.
I already publish SPF version 1 records in my DNS TXT records.
So far, my preliminary analysis is that I can leave these alone, and
add a Resent-From header to my mailings. The Resent-From would
contain my domain name, and should be verified in place of the From
Therefore, all would be well.
First, would anybody like to comment on this logic.
Second, I have attempted to ask Microsoft/Hotmail this question, and
here is a reply from the frontline support desk.
There are no plans to change how we "enforce" Sender ID. There were
incorrect reports about this a while ago; however we do not reject a
message or place a message in the junk folder solely on the basis of the
Sender ID test, nor do we plan to.
I'm not sure they are answering the question that I asked, or was
trying to ask.
Does anybody have any knowledge pertaining to MSN/Hotmail plans with
regards to Sender ID, and how mailing lists can cope.