I've updated the ESMTP patch for 1.5.11. It now supports $envelope_from_address. You can find it at: http://mutt.kublai.com/patches/patch-1.5.11.bc.smtp.10 I've also set up a couple of mercurial trees (a CVS mirror and the one I keep my SMTP stuff in), with maybe more to come... linked from http://mutt.kublai.com -b