Using telnet to test your SMTP server: Difference between revisions

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You should see a prompt like the the following:
You should see a prompt like the the following:


''220 mail.mydomain.com ESMTP server ready.''
''220 mail.mydomain.com ESMTP server ready.''


Enter the standard SMTP greeting with your hostname
Enter the standard SMTP greeting with your hostname
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You should see the following reply:
You should see the following reply:


''250-mail.mydomain.com Hello mail.testdomain.com; ESMTPs are:''
''250-mail.mydomain.com Hello mail.testdomain.com; ESMTPs are:''
 
''250-TIME''
''250-TIME''
 
''250-SIZE 0''
''250-SIZE 0''
 
''250 HELP''
''250 HELP''


We now need to tell the server who the mail is from. Type in the following:
We now need to tell the server who the mail is from. Type in the following:
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You should see the following response:
You should see the following response:


''250 Sender OK - send RCPTs.''
''250 Sender OK - send RCPTs.''


Now we need to enter the name of a recipient. Type in the following:
Now we need to enter the name of a recipient. Type in the following:
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You should see this response:
You should see this response:


''250 Recipient OK - send RCPT or DATA.''
''250 Recipient OK - send RCPT or DATA.''


We are going to send some data so simply enter the following:
We are going to send some data so simply enter the following:
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You should now see this response:
You should now see this response:


''354 OK, send data, end with CRLF.CRLF''
''354 OK, send data, end with CRLF.CRLF''


Now we enter our subject. After giving the subject you can hit enter and type a quick message. To send the message press enter after your last sentance and on a new line with a blank line above simply enter a full stop(period) on its own as the example below shows:
Now we enter our subject. After giving the subject you can hit enter and type a quick message. To send the message press enter after your last sentance and on a new line with a blank line above simply enter a full stop(period) on its own as the example below shows:
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You should now recieve the following response:
You should now recieve the following response:


''250 Data received OK.''
''250 Data received OK.''


Thats it! All done and the mail has been sent. All that is needed is to issue the last and final command:
Thats it! All done and the mail has been sent. All that is needed is to issue the last and final command:
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And now we recieve the final output before the telnet session terminates:
And now we recieve the final output before the telnet session terminates:


''221 mail.mydomain.com Service closing channel.''
''221 mail.mydomain.com Service closing channel.''
 
 
[[Category:Technical]][[Category:Web]]

Latest revision as of 07:01, 4 May 2016

Use a telnet client to telnet to your mail server on port 25

telnet mail.mydomain.com 25

You should see a prompt like the the following:

220 mail.mydomain.com ESMTP server ready.

Enter the standard SMTP greeting with your hostname

HELO mail.testdomain.com

You should see the following reply:

250-mail.mydomain.com Hello mail.testdomain.com; ESMTPs are:

250-TIME

250-SIZE 0

250 HELP

We now need to tell the server who the mail is from. Type in the following:

MAIL FROM:user@testdomain.com

You should see the following response:

250 Sender OK - send RCPTs.

Now we need to enter the name of a recipient. Type in the following:

RCPT TO:user@mydomain.com

For some SMTP servers you may need to enclose the recipient e-mail address with <> as in the following:

RCPT TO:<user@mydomain.com>

You should see this response:

250 Recipient OK - send RCPT or DATA.

We are going to send some data so simply enter the following:

DATA

You should now see this response:

354 OK, send data, end with CRLF.CRLF

Now we enter our subject. After giving the subject you can hit enter and type a quick message. To send the message press enter after your last sentance and on a new line with a blank line above simply enter a full stop(period) on its own as the example below shows:

Subject: Test Message
This is a test message.

.

You should now recieve the following response:

250 Data received OK.

Thats it! All done and the mail has been sent. All that is needed is to issue the last and final command:

QUIT

And now we recieve the final output before the telnet session terminates:

221 mail.mydomain.com Service closing channel.