Using Telnet to Send Mail

Sending email through telnet can be a useful tool when testing mail functionality, testing for open relays, or sending mail from admin scripts. This is something I don’t use often enough, so I’ve created this blog as a reminder.

1. Open the cmd prompt.
2. Type telnet <server> 25
3. Type HELO <domain>
4. Type MAIL FROM: <email address>
5. You may get a message saying “250 ok“
6. Type RCPT TO: <email address>, <email address>, <email address>, etc.
7. You may get another message saying “250 ok“
8. To write the message, type DATA, followed by your message.
9. To enter a Subject, type SUBJECT:, followed by your message.
10. To end the message, put a period on a new line by itself and press Enter.
11. Type QUIT to exit Telnet.

Source: http://www.wikihow.com/Send-Email-Using-Telnet