[Nmh-workers] DKIM verification support

[Ken Hornstein]

When I was looking at Bob's spam problem, I started thinking ... is there
any interest in support DKIM signature verification of messages?  It looks
relatively straightforward.  It could be rolled into some hypothetical
S/MIME support.  This is just a vague thought, but I thought it might
be useful.  We'd need to work out a lot of implementation details.

--Ken