Configure Ice Warp with Google Cloud DNS

Hello 

I'm trying to configure my Ice Warp mail server to work with our Google Cloud DNS.  A lot of our emails are ending up in the spam folders after we send them  I've configured google cloud with the required 

A, MX, CNAME, SPF, DKIM, and DMARC records

Also have set up a PTR record in a reverse lookup zone which is the reverse lookup of the IP addy of our Ice warp server.

Ran a test on Google Toolbox and received this outcome.  Can anyone give me some info as to what needs to be setup on the server or in DNS to get it right?  I don't want to guess at things...just want to get it right

Thanks