A few weeks back I posted about changes a client of mine was making in order to improve their IP reputation and their delivery.
They are now getting inbox delivery at the major ISPs.  Their actions are up and  they are seeing great results.
They did not implement all of my specific suggestions. Instead, they took the underlying advice, and modified it to fit their needs. They took my advice to increase relevancy and engage their recipients, then applied their own knowledge of their recipients and made changes to their mailings. The result is lower complaints, better delivery and more responsiveness.
Clients are happy. Recipients are happy. Everything is good.

Deliverability