Thursday, December 29, 2011

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 25
Connected to localhost.localdomain (
Escape character is '^]'.
220 ESMTP Sendmail 8.13.8/8.13.8; Fri, 30 Dec 2011 04:04:06 +0530
250 Hello localhost.localdomain [], 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
354 Enter mail, end with "." on a line by itself
hi test1
250 2.0.0 pBTMY6ln018613 Message accepted for delivery
221 2.0.0 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=<>, proto=SMTP, daemon=MTA, relay=localhost.localdomain []
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
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