However, before possibly shifting to yet another list (opendkim-*), it may
be useful to discuss whether we want to limit signatures to parts that won't
be dropped, e.g. using l= or similar tag. For example, alternative HTML
text poses a difficulty, because either part can be used, or dropped. How
about adding a "part-hash" in each entity's header?
There's always PGP, a paradigm where SMTP is merely the transport
layer over which the communication rides in a secure tunnel.
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