I like to test all my new mail servers with telnet making sure they are not open relays, and that the amavis and clamav processes are working correctly. I just check after I send a message in the logs.
$ telnet 192.168.0.4 25
RESPONSE 220 192.168.0.4 is a mail server
helo wantlinux.net
RESPONSE 250 mail.example.com
mail from:
RESPONSE 250 2.1.0 Ok
rcpt to:
RESPONSE 250 2.1.5 Ok
data
RESPONSE 354 End data with .
Hello webmaster@example.com. How are you?
sincerely,
webmaster@wantlinux.net
.
RESPONSE 250 2.0.0 Ok: queued as ##########
quit
I thought it was hard to remember all that, but once you use it a few times you will not be looking up this information anymore. I telnet to email servers all the time for testing purposes, and I have never had an issue. If you use windows just open up a command prompt, and try the commands. If it doesn’t work download a Ubuntu or other Linux image and install it. Like always leave a comment if you have questions.
