1# convert source domain address to a chain a@b@c@d... 2@([^@!,]*):([^!@]*)@([^!]*) alias \2@\3@\1 3@([^@!]*),@([^!@,]*):([^!@]*)@([^!]*) alias @\1:\3@\4@\2 4 5# convert a chain a@b@c@d... to ...d!c!b!a 6([^@]+)@([^@]+)@(.+) alias \2!\1@\3 7([^@]+)@([^@]+) alias \2!\1 8 9# all mail 10plan9\.bell-labs\.com!(.*) | "/mail/lib/qmail '\s' 'net!plan9\.bell-labs\.com'" "'\1'" 11.* | "/mail/lib/qmail '\s' 'net!plan9\.bell-labs\.com'" "'&'" 12