Tue, 2 Feb 2010 15:28:14 -0500
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> "sender=list" appears to have done the trick (messages are no longer
> flagged as suspicious by hotmail).
Right -- issues with "On Behalf Of" aside, Sender=List is always your best
bet for delivery to Microsoft sites. The reason is that Microsoft's
SenderID Framework (SIDF) "improves" (*cough*) upon SPF by taking into
account the Sender: and From: headers of a message prior to evaluating the
message return path (MAIL FROM).
For more information about LISTSERV, SPF, SIDF, and other fun stuff
(DomainKeys), see the following paper:
http://www.lsoft.com/news/techtipLSV-issue3-2006-us.asp
(Footnote 2 talks about the Sender: header and its relationship to SIDF.)
For my money, you're usually better off using Sender=List and dealing with
complaints about "On Behalf Of" from Outlook users than using Sender=None
and dealing with complaints about mail not being delivered to MSN users.
Pick your Microsoft-induced poison :)
And for the record, Sender=List is the documented default for LISTSERV.
--
Liam Kelly
Senior Consulting Analyst
L-Soft international
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