We currently use CodeTwo on our on-prem Exchange. We're in a Hybrid an moving fully (eventually) to Exchange Online. While C2 has an cloud version, their not based in the US, and support is sub-par. The good feature it has it can strip attachments from emails based on rules and put them in a network location; something that Exclaimer couldn't do at the time. Also,we have a lot of Out of Office rules for users that leave the company.
We're not concerned about price, need an enterprise solution thats powerful and with great support.
Any recommendations would be greatly appreciated.