IN the web admin in surgemail go to the dkim config page and it will 
help you create a DKIM private key and enable the signatures.

It will also give you the dns entry you need to add, this is done in 
your dns server (which may not be on any of your systems, it's most 
likely handled by your hosting company).

ChrisP.


On 31/05/2016 2:22 a.m., surgemailHIDDEN@etwinsite.com wrote:
> Whenever I try to send E-mails form my Surgemail account to a G-Mail account I see under gmail a "?" (Email authentication)
>
>  From my understanding this is related to DKIM, Domain Key
>
> I would like to have my server authenticated but I'm not sure what exactly needs to be done,
>
> I'm on a windows domain, using Surgemail on Ubuntu, with my host forwarding the mx records to my static IP.  I read that I needed to create a DNS entry but I'm unaware if this needs to be on the windows server, my host or my surgmail server.
>
> If anyone has any information in this it would be greatly appreciated.