Plan 9 from Bell Labs’s /usr/web/sources/plan9/mail/lib/qmail
#!/bin/rc # qmail sender machine user... rfork s upas/vf | upas/qer /mail/queue smtp $* || exit 'qer failed' upas/runq -n 10 /mail/queue /mail/lib/remotemail </dev/null >/dev/null >[2=1] & exit ''