Hi there,
It look like from output of pingability.com email send was rejected. Most ISP blocks outgoing emails from (A)DSL/PPP internet connections.
However as you said you can configure your Postfix mail server to send email-using ISP authenticated gateway this is the best solution for both your desktop and squirrelmail webbased clients. Just add following line main.cf:
Code:
relayhost = smtp.yourispmailserver.com
And restart postfix service. If you have, more question feel free to hit reply button
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