We are experiencing these issues as well after migrating to Hubspot from another platform. We have seen dismal open rates on Hubspot vs. our other platform, and we willingly took any and all advice our account manager offered with no result - yes, this includes not sending to unegaged contacts, changing subject lines, segmentation, using “good” contact lists. It seems to me that Hubspot’s high deliverability rates don’t really apply to industries with stricter firewalls. We have asked about more advanced email sending capabilities that improve deliverability, like staggered sending, and our account manager hadn’t even heard of the term. It’s really time for Hubspot to come off their high horse on this one - I just don’t think the problem is a possible “spammy” subject line but rather their use of sending IPs not really working for contacts within certain industries. The oversight on this issue is… shocking for a thought leader. But far worse, it seems that on this (and the other, unfortunately mounting, issues we are experiencing with Hubspot) we always end up in a place where the recommendation is that we, the customer, purchase an add-on or integration to make the platform more robust. @andrus while it’s true that Hubspot has some content about email deliverability, our support experience on the matter indicates that this information is more applicable to B2C emailing.