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Manual testing
Chapter 13: Communication and Messaging Systems
You can manually test your server for SMTP relay by telnetting to the e-mail
server on port 25. Follow these steps:
1. Telnet to your server on port 25.
You can do this in two ways:
• Use your favorite graphical telnet application, such as HyperTerminal
(which comes with Windows) or SecureCRT (www.vandyke.com/
products/securecrt/index.html).
• Enter the following command at a Windows or UNIX command
prompt:
telnet mailserver_address 25
You should see the SMTP welcome banner when the connection is made.
2. Enter a command to tell the server, “Hi, I’m connecting from this
domain.”
After each command in these steps, you should receive a different-
numbered message, such as 999 OK. You can ignore these messages.
3. Enter a command to tell the server your e-mail address.
For example:
mail from:yourname@yourdomain.com
You can use any e-mail address in place of yourname@yourdomain.com.
4. Enter a command to tell the server who to send the e-mail to.
For example:
rcpt to:yourname@yourdomain.com
Again, any e-mail address will suffice.
5. Enter a command to tell the server that the message body is to follow.
For example:
data
6. Enter the following text as the body of the message:
A relay test!
7. End the command with a period on a line by itself.
You can enter ? or help at the first telnet prompt to see a list of all the
supported commands and, depending on the server, get help on the use
of the commands.
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