Staying On-Premises for ever, why updating to Exchange Server vNext and paying a monthly suscription when there are no any updates, new features or improvements to On-Premises Exchange for years?
All updates, new features or improvements in last years are for Exchange Online only. I'm reclaiming more features, like DKIM support and more for On-Premises Exchange Server, but nothing.
Also, in all posts in blogs, tells about that improvements and new features goes only to Exchange Online. The Exchange Team are only focusing on Exchange Online and only little improvements or bug fixes goes to On-Premises Exchange Server. Seems to be deprecating On-Premises Exchange Server.
The Exchange Team told in a blog post in 2019:
https://techcommunity.microsoft.com/t5/exchange-team-blog/faqs-from-exchange-and-outlook-booths-at-2019-microsoft-ignite/ba-p/1053448
Office 365 is our focus for features. We ship features to Office 365 first and may deliver a sub-set of those features that make sense for on-premises. We look at the capabilities individually to determine how readily they can be deployed and sustained in on-premises landscapes, but the maximum value and feature set will always be in Exchange Online.
There is no roadmap for the DKIM and DMARC features to be included with Exchange on-premises.