Overall, I believe a MLM SHOULD always hash headers it adds or
changes. Some additional headers often common with MLM are:
Precedence:
Errors-to:
What is the reasoning not to include these in the MLM core headers listed?
I have read somewhere some ESP/ISP receivers (YAHOO?) use Precedence:
header in part of their "secret sauce" to increase acceptance.
N'est-ce pas?
The Errors-To: header does have MLM history and it continues to be
user by many MLMs. Our MLM uses it and the IETF-DKIM MLM also uses it.
There is a historical note [1] this header may be harmful, but in a
DKIM era, this header can be protected like other MLM core headers.
--
Hector Santos, CTO
http://www.santronics.com
http://santronics.blogspot.com
[1]
http://www.ietf.org/mail-archive/web/ietf-message-headers/current/msg00038.html
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