How to send mails using telnet

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This post explains how to send mails to the users in the same system. From the user aswath to the user ajith. This is useful to troubleshoot mail server issues.

[root@localhost ~]# telnet 127.0.0.1 25
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 localhost.localhost.com ESMTP Sendmail 8.13.8/8.13.8; Fri, 30 Dec 2011 04:04:06 +0530
helo 127.0.0.1
250 localhost.localhost.com Hello localhost.localdomain [127.0.0.1], pleased to meet you
mail from:<aswath@localhost.localdomain>
250 2.1.0 <aswath@localhost.localdomain>... Sender ok
RCPT TO:<ajith@localhost.localdomain>
250 2.1.5 <ajith@localhost.localdomain>... Recipient ok
data
354 Enter mail, end with "." on a line by itself
subject:test1
hi test1
.
250 2.0.0 pBTMY6ln018613 Message accepted for delivery
quit
221 2.0.0 localhost.localhost.com closing connection
Connection closed by foreign host.
You have new mail in /var/spool/mail/root
[root@localhost ~]#

The mail log is as follows.

[root@localhost ~]# tail -f /var/log/maillog
Dec 30 04:05:02 localhost sendmail[18613]: pBTMY6ln018613: from=<aswath@localhost.localdomain>, size=23, class=0, nrcpts=1, msgid=<201112292234.pBTMY6ln018613@localhost.localhost.com>, proto=SMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Dec 30 04:05:02 localhost sendmail[18615]: pBTMY6ln018613: to=<ajith@localhost.localdomain>, ctladdr=<aswath@localhost.localdomain> (501/501), delay=00:00:38, xdelay=00:00:00, mailer=local, pri=30380, dsn=2.0.0, stat=Sent