On Sat, Sep 10, 2016 at 07:36:27PM -0400, Robert J. Hansen wrote: > > Hmm, OK that's kind of what I thought. But I'm still a little > > confused. Doesn't the email server have to support it? > > No. > > > Or would the "to" be one of those things not encrypted? > > Headers that are strictly required to process email are not armored.
Actually the "To:" and "From:" headers could be armoured without real trouble since they're included in the data portion with the "Subject:" and whatever else any given MUA wants to include. It's the "rcpt to" and "mail from" headers that couldn't be, along with the relay data from SMTP, IMAP and/or POP3 transactions. It's just that the "To:" address usually matches the "rcpt to" address and the "From:" address usually matches "mail from" (mailing lists being one of the more common exceptions to that). Regards, Ben
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