How to Test SMTP via Telnet

Telnet to your mailserver

telnet mail.domain.com 25
EHLO domain.com
MAIL FROM:<sender@domain.com>
RCPT TO:<recipient@domain.com>
DATA
Subject: This is a subject line

Press Enter twice; a blank line is needed between the Subject field and the message body.

Type the rest of your message, then press Enter.

To finish the message, type a period ( . ) and press Enter

QUIT

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