SMTP with Telnet
Nothing spectacular here, but at times you may need to manually test an SMTP connection, so here is how (the mail server responses are italic):
telnet mailhost.domain.com 25
220 mailhost.domain.com ESMTP MAILHOST
helo yourhost.yourdomain.com
250 mailhost.domain.com Hello yourhost.yourdomain.com [yourip], pleased to meet you
mail from: youremail@yourdomain.com
250 2.1.0 Sender ok
rcpt to: recipientemail@recipientdomain.com
250 2.1.5 Recipient ok
data
354 Enter mail, end with “.” on a line by itself
Subject: Test Message
Test Message
.250 2.0.0 Message accepted for delivery
quit
The responses may vary a bit depending on the SMTP server but that is basically it.
Details on the SMTP server response codes can be found in rfc2821 check sections 4.2.2 and 4.2.3
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