mailaddr(7) Miscellaneous Information Manual mailaddr(7) mailaddr - SMTP . user@domain . : john.doe@monet.example.com John Doe john.doe@monet.example.com (John Doe) ("monet.example.com") . . . ("john.doe") . . : "surname/admd=telemail/c=us/o=hp/prmd=hp"@some.where USER%SOMETHING@some.where machine!machine!name@some.where I2461572@some.where ( X.400 UUCP .) ("John Doe") <> () . ( .) "" ".": "John Q. Doe" . example.com "john.doe@monet" John Doe. . . Route-addrs . "route-addrs". : <@hosta,@hostb:user@hostc> hosta hostb hostc. route-addrs hostc. route-addrs . . "user@hostc" . Postmaster "postmaster" . "postmaster" . /etc/aliases ~/.forward mail(1), aliases(5), forward(5), sendmail(8) IETF RFC 5322 3 . . : . 4.2 Berkeley Distribution 8 2026 mailaddr(7)