Configure an email address that is not on your server to go through your server and see if its rejected.
jason
> On 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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