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Read this in the dovecot sieve wiki: "The envelope sender is taken from a Return-Path: header in the message. The envelope recipient is taken from -d option passed to deliver." Is "-d" still a valid deliver switch? When I configure postfix's main.cf like so... mailbox_command = /usr/local/libexec/dovecot/deliver -d -e ..it sqwaks with, "Jun 18 18:44:50