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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