Listing 2. Verifying that Postfix Is Working Properly

[usera@ws]$ telnet MY.VPS.IP.ADDRESS 25
Trying MY.VPS.IP.ADDRESS
Connected to MY.VPS.IP.ADDRESS.
Escape character is '^]'.
220 first.domain ESMTP
HELO example.com
250 first.domain
MAIL FROM: test@example.com
250 Ok
RCPT TO: promo@first.domain
250 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
This is a test

250 Ok: queued as MESSAGEID
QUIT
221 Bye
Connection closed by foreign host.