Nov 10, 2018

How to check for Open Relay for email server

Browser-Based Checking


Manual Relay Test per Telnet

telnet it.i88.ca 25
<-- 220 it.i88.ca ESMTP Postfix
--> HELO example.com
<-- 250 it.i88.ca
--> MAIL FROM: i88.ca@example.com
<-- 250 Ok
--> RCPT TO:<valide.email@example.com>
<-- 554 <valide.email@example.com>: Relay access denied