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In this Document

Goal

Solution

Steps to perform from a client host:

Applies to:

Goal

 How to use telnet to test SMTP servers

Solution

Note: The assumption for testing mail delivery is that there are no firewalls or router blocking or obfuscating TCP port 25 traffic between the testing host and the SMTP server.

Another assumption is that the mail server being tested has been configured to deliver mail to the mail account being tested.

Steps to perform from a client host:

1. Many SMTP servers to not echo the characters that they receive back to the sending host. To see the characters that you type in telnet sessions, start telnet by typing “Telnet” at a command prompt. Set the parameters to do a local echo of typed keystrokes back to the console.

• For the telnet version bundled with Windows 2000 clients, the command is set localecho.
• For the telnet version bundled with Windows 2003 clients, the command is set local_echo.

2. Open a telnet session with the SMTP server on port 25 of its IP address. This is accomplished with the following command:

• open IP_Address_of_SMTP_server 25

3. Next, begin the SMTP protocol handshake with the hello command.

4. Next, you will provide the source mail address for the test email you are about to send. If the server responds with an error relating to the name not being recognized, the server may have been configured to only accept messages from the local domain. Try a known mailbox from the local   domain. The command is:

• mail from:mailbox_name@dns_domain_name

5. Now you must provide the destination mail address for the test email you are about to send. This address must be a valid mailbox whose contents you can verify for receipt after the procedure. The command is:

• rcpt to:mailbox_name@dns_domain_name

6. To provide some content to the body of the message, the next command you will type is:

• Data

You can then type some random data. To end the data input session, type a carriage return (Enter key) followed by a period (.) followed by another carriage return (Enter key).

7. To end the session, simply type QUIT.

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