Open Command Prompt

1. Telnet [mailserver/ip] [port]

2. Type “EHLO domain.com” and hit enter.

3. Type “MAIL FROM:sender@domain.com” and hit enter.

4. Type “RCPT TO:recipient@domain.com” and hit enter.

5. Type “DATA” and hit enter.

6. Type your message body and hit enter.

7. Type ” . ” to end the message and press enter.

If you received the mail then your SMTP is working fine.