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
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