EAS proxy configuration.

Question

Could someone please post a step-by-step walkthrough for configuring the EAS proxy for email in Sophos Central? I've followed all the help I can find and still no success. 
 In the Exchange policy which server details do I enter, Sophos Central SMC or the server hosting EAS proxy? Which, if any URLs do I need to publish externally? Which ports from/to do I need to allow/expose? 
 I have a ticket open, but the response is, as always, abysmal. Weeks on and the only response from Sophos Support has been to downgrade the ticket. 
 
 Thanks.

Barb@Sophos · Answer

Hello RichardPhillips, 
 Here's some documentation for Sophos Central and EAS: 
 Download the EAS proxy installer Install the standalone EAS proxy Configure a connection to the standalone EAS proxy server Additional information about setting up the External EAS Proxy 
 Can you please provide more information regarding what is the issue that you are experiencing? 
 Regards,

Neil_Evolve · Answer

Hi Richard, 
 No, I never did get a satisfactory response from Sophos. 
 Whilst Barb@Sophos has provided a response, you also need to refer to the EAS standalone proxy information in this document, 
 Together with the information from Barb, you should be able to figure it all out. 
 Cheers.