Send test email via telnet

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 server.server.com 25​

HELO jaytag.co.uk (response will be 250 OK)

MAIL FROM:dmcmillan@jaytag.co.uk (response should be 250 OK – mail from dmcmillan@jaytag.co.uk)

RCPT TO:james@stephenrjames.com (response should be 250 OK – Recipient james@stephenrjames.com)

DATA (response should be 354 Send data. End with CRLF.CRLF) - See more...