# File lib/action_mailer/vendor/tmail-1.2.3/tmail/mailbox.rb, line 276 def UNIXMbox.fromaddr(port) h = HeaderField.new_from_port(port, 'Return-Path') || HeaderField.new_from_port(port, 'From') || HeaderField.new_from_port(port, 'EnvelopeSender') or return 'nobody' a = h.addrs[0] or return 'nobody' a.spec end