It's often useful to test an email server manually - to ensure the port is open and redirected properly, and also that the server is delivering messages to the mailbox correctly.

Here is how to send an email manually with telnet:

Open a command prompt on the PC you will send the test email from

telnet 25
HELO (response will be 250 OK)
MAIL (response should be 250 OK - mail from
RCPT (response should be 250 OK - Recipient
DATA (response should be 354 Send data. End with CRLF.CRLF)
Test Email!
(line break)
(line break)

A successful delivery will look something like this: 250 OK

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