Sendmail
send mail with netcat
. 250 ok: Message 222220902 accepted QUIT 221 myrelay.domain.com Connection closed by foreign host. [user@host]# [user@host]# telnet smtp.domain.com 25 Trying 192.168.0.1... Connected to smtp.domain.com (192.168.0.1). Escape character is '^]'. 220 myrelay.domain.com ESMTP HELO smtp.domain.com 250 myrelay.domain.com MAIL FROM:<alice@hacker.com> 250 sender <alice@hacker.com> ok RCPT TO:<bob@secure.net> 250 recipient <bob@secure.net> ok DATA 354 go ahead From: [Alice Hacker] <alice@hacker.com> To: [Bob Smith] <bob@secure.net> Date: Mon, 12 Apr 2010 14:21:26 -0400 Subject: Test Message Hi there! This is supposed to be a real email... Have a good day! Alice . 250 ok: Message 222220902 accepted QUIT 221 myrelay.domain.com Connection closed by foreign host. [user@host]#
SMTP servers for internet providers
mailrelay.bostream.com smtp smtp.bredband.net smtp
set smarthost and domain. /etc/mail/sendmail.mc define(`SMART_HOST', `smtp.bredband.net') LOCAL_DOMAIN(`www.halfface.se')dnl Enable smtp on all interfaces. /etc/mail/sendmail.mc DAEMON_OPTIONS(`Port=smtp,Name=MTA')dnl Usermappings. /etc/mail/virtusertable anden@halfface.se bjorklun andreas.bjorklund@halfface.se bjorklun stannaks@halfface.se stannaks none@halfface.se error:nouser 550 No such user here wrong@halfface.se error:5.7.0:550 Address invalid @halfface.se bjorklun anna-karin@sivberg.se stannaks @sivberg.se stannaks @mobbad. bjorklun @anden.homeip.net bjorklun ---- aliases for your host <verbatim> /etc/mail/local-host-names anden.homeip.net www.halfface.se halfface.se www.mobbad.nu mobbad.nu www.sivberg.se sivberg.se ---- Access rights. Who can send mail and username and password at www.bredband.net smtp server. <verbatim> /etc/mail/access localhost.localdomain RELAY localhost RELAY 127.0.0.1 RELAY 192.168.2.1 RELAY 192.168.3.1 RELAY AuthInfo:smtp.bredband.net "U:b586378" "I:b586378" "P:??????" "M:LOGIN PLAIN" ---- Forward a copy of email. ~/.forward \bjorklun andreas.bjorklund@infineon.com