destination address mail interface mail system mailing list s network mailer network-specific mailer parsing rule pattern match user name /etc/passwd c /usr/lib/upas/names c /usr/lib/upas/rewrite c /usr/lib/upas/auth c /usr/lib/upas/translate c /usr/lib/upas/route c sendmail s rewrite commands s structure of Upas s ? operator p address-list alias S >> S I | S translate S auth S config directory f ed c egrep c I make c SMTP RFC822 uucp Upas \(em a Simpler Approach to Network Mail g Message Routing s Message Format Conversion s User Control s Concealing Machine Names s Loop Detection s Installation s Comparison With Sendmail s translate