http://mxtoolbox.com/SuperTool.aspx

My favorite for network tests. They have an option in the drop down to 
test an email server and will let you know if you have an open relay or 
not.


On 2015-10-11 15:34, Keith Smith 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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-- 
Nathan England (480) 559 - 9681
nengland@nmecs.com
http://www.nmecs.com/
Web Developer, PHP Programmer, Lamp Administration, and
Information Security Specialist


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