I sign all my outgoing mail, and I have a feedback loop set up with
Yahoo, which being very modern and advanced keys on signatures, not IP
addresses. A few days ago I sent some messages to one of the Freebsd
mailing lists. Today some Yahoo user who subscribes to that list hit
the spam button. Freebsd's list software (Mailman, I think) doesn't
sign, and doesn't strip any headers. So what happened? Yahoo saw my
signature and sent the reports to me, which was of course useless
since I don't run the list.
Would this still be an issue if the lists were signing the outbound mail?
You'd hope that Yahoo would then send the feedback reports to the list owner.
Probably not. It depends if the list owner has an FBL of their own, which
small senders generally don't.
If that's the case, then the preferred behaviour must be to sign the message,
DKIM header included.
The list should certainly sign, but the old signature has to go, since the
reputation of a list's mail belongs to the list, not the contributors.
R's,
John
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