Drop in open rates for recipients w/ Gmail addresses
When we switched to HubSpot, we started seeing a precipitous drop in open rates specific to Gmail addresses. Further investigation shows that our email newsletters are now increasingly going into gmail users' promotions tab, rather than the in-box. We're also seeing an uptick in newsletters going to spam.
This is something that changed upon the switch from mailchimp to HS. How do we affect change in the other direction?
Nothing changed about the nature of the email newsletters we're sending (including the from address, etc.). But Gmail's reaction to the HubSpot sends is definitely new.
Looking for any advice on how to push things back to the inbox.