We have 2 domains one of which is a google domain. domain b goes to my exchange server.We are authoritative of domain A which is the google domain. All emails from this domain is coming to my exchange server. What i have noticed that some of them end up in SPAM. To be exact most of them are google docs. What do i need to do to solve this problem permanently. i have already told my ISP to setup (v=spf1 include:_spf.google.com ~all). Is this correct as i think it is flagging them as spam as we are authoritative for google domain.
Do i also need to add another spf for my domain?
What can i do to get DMARC, DKIM and SPF. I currently have SPF at my internal DNS, is this the same one required at public dns. I was told for google to be able to send emails i needed to add (v=spf1 include:_spf.google.com ~all).
Thanking in advance