Sendmail

send mail with netcat

[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.

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