On Fri, Oct 09, 2020 at 09:28:58PM -0400, Demi M. Obenour wrote: > > Multiple addresses in one From: header are allowed by the RFC 5322 spec. > > Multiple From: headers in a message are not OK. > > What are the semantics of a From: header with multiple addresses?
The message purports to be the work of multiple authors. Such a message
is required to have a "Sender" header, but in most cases that constraint
is unlikely to be enforced.
--
Viktor.
