P-E-B-C-A-K

If you want to set up your email so that you send it using esmtp and mutt, be sure to put "set use_envelope_from=yes" in your mutt configuration, or dreadful things will happen and your mail will end up in the ether between the worlds. Really.

Actually, I wonder how many of my problems with using "real" mail transport agents and mutt would have been avoided had I known about the existence of this simple option. Oh well, live and learn.