Telnet your email server

Posted on 12th May 2009 Leave a comment (8) Go to comments

Very often it is necessary to test that your SMTP server is working.
The easiest way to do this is with the telnet command.
This lets you talk directly to the email server in its own SMTP protocol script language.

Here’s how…

telnet server name or IP address 25
HELO aaaa
mail from: <tom@fromdomain.com>
rcpt to: <fred@todomain.com>
data
Enter your message text
.
quit

Along the way you should see feedback from the server to each command entered
See below
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e.g.

Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 mailserver.local ESMTP Exim 4.43 Tue, 12 May 2009 10:31:00 +0100
helo aaaa
250 mailserver.local Hello mailserver.local [127.0.0.1]
mail from: <tom@fromdomain.com>
250 OK
rcpt to: <fred@todomain.com>
250 Accepted
data
354 Enter message, ending with "." on a line by itself
A message for myself.
.
250 OK id=1M3oKj-0006Sn-9u
quit
221 mailserver.local closing connection
Connection closed by foreign host.
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8 Comments.

  1. KrisBelucci 3rd June 2009 at 1:37 am

    Hi, good post. I have been wondering about this issue,so thanks for posting.

  2. CrisBetewsky 6th July 2009 at 6:13 pm

    I’m glad that after surfing the web for uch a long time I have found out this information. I’m really lucky.

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