On May 24, 2011, at 11:29 AM, Stephen J. Turnbull wrote: >Barry Warsaw writes: > > > What's the legitimate use case for multiple From headers? > >Technically, there is none. RFC 5322 requires exactly one From field, >and that's that. http://www.ietf.org/rfc/rfc5322.txt, table in >section 3.6. (Resent-From, of course, is a different kettle of fish.) > >However, presumably multiple addresses in the From field (same URL, >section 3.6.2) would have the same effect on Mailman's (current) >filtering strategy.
Actually, I think MM3 could handle either case:
field_values = self.get_all(header, [])
senders.extend(address.lower() for (real_name, address)
in email.utils.getaddresses(field_values))
-Barry
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