Email testing with telnet

example:

$ telnet yourmailserver.com 25

Trying 21.40.23.46...

Connected to yourmailserver.com.

Escape character is '^]'.

220 mx.yourmailserver.com ESMTP Sendmail 8.12.9/8.12.9; Thu, 12 Jun 2003 10:06:19 -0700

helo frommail.com

250 main.signalq.com Hello [12.24.14.32], pleased to meet you

mail from: butter22333@frommail.com

250 2.1.0 butter22333@frommail.com... Sender ok

rcpt to: webmaster@yourmailserver.com

250 2.1.5 webmaster@yourmailserver.com... Recipient ok

data

354 Enter mail, end with "." on a line by itself

Subject: test message

this is a test

.

250 2.0.0 h5CH6GVI015806 Message accepted for delivery

quit

221 2.0.0 mx.yourmailserver.com closing connection

Connection closed by foreign host.