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When setting up a mail server sometimes its handy to be able to test from the command line.

This can be accomplished with telnet or openssl

Telnet

telnet mx.server.tld 25

ehlo my.hostname
Mail From: [email protected]
RCPT To: [email protected]
DATA
From: [email protected]
Subject: Put your subject here
Place the body of your message here then place a period on a line all by itself to finish the body of the message

.

Testing SMTP/TLS with OpenSSL Client

openssl s_client -connect mx.server.com:25 -starttls smtp

ehlo my.hostname
Mail From: [email protected]
RCPT To: [email protected]
DATA
From: [email protected]
Subject: Put your subject here
Place the body of your message here then place a period on a line all by itself to finish the body of the message

.
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