Testing SMTP using Telnet

This is the syntax to use to test SMTP relays. Commands are in bold:

telnet x.x.x.x 25
HELO mydomain.com
250 mobile.yourdomain.com Hello mydomain.com ([]), pleased to meet you

MAIL FROM: dmatthew@mydomain.com
250 dmatthew@mydomain.com… Sender OK

RCPT TO: dmatthew@yourdomain.com
250 dmatthew@yourdomain.com… Recipient OK

354 Enter message, end with “.” on a line by itself
hello hello hello what a nice day

250 Message accepted for delivery

221 mobile.yourdomain.com SMTP Service closing transmission channel

Connection to host lost.

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