google open relay test there are a number of ways to test. If you are
behind cox then you have to use a forward via one of their servers.

On Sun, Oct 11, 2015 at 3:34 PM, Keith Smith <techlists@phpcoderusa.com>
wrote:

>
>
>
> Hi,
>
> How can I verify my server is not an open relay which will allow others to
> send spam through my box?
>
> Ubuntu 14.04LTS
> Postfix+Dovecot
>
> Thanks in advance
>
> Keith
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen