Manual SMTP Relay Check

by Wolfram Saringer  (2014-03-19)
last change: 2014-03-19

Have a simple conversation with your SMTP server using telnet to port 25:

--> HELO youthostname
<-- 250 smtpservername
--> MAIL FROM: xx@xyz.xx
<-- 250 Ok
--> RCPT TO: <xx@xyz.xx> (place recipient address here)
<-- 554 <xx@xyz.xx>: Relay access denied

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