An interesting side effect is that it would also suppress bounce messages
from mailing lists, even if they resigned. I'm not sure if this is a
feature or a bug.
So, yeah, if the SSP associated with the MailFrom says
"rfc2821.MailFrom" must match a DKIM signature, or somesuch, then a
mailing list that inserts its own MailFrom, without adding its own
signature, could break bounces.
I wouldn't worry too much about that scenario, since if anyone sets that
flag, everyone will be throwing away his mailing list mail anyway.
R's,
John
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