Thursday, August 2, 2018

email server - MXToolbox: "Reverse DNS is not a valid Hostname"

I know that there is another thread about this topic here on serverfault.com but it did not solve my issue.



I have also googled it and it seems that SPF record could be mis-configured in some cases but it did not help me neither.



Can someone tell please me why I am getting the "Reverse DNS is not a valid Hostname" error:
http://mxtoolbox.com/SuperTool.aspx?action=smtp%3awebkonsulenter.dk&run=toolpage#



Thank you very much :-)

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