The HCL Domino Development team has identified an issue which will affect *ALL Domino server versions* as of TODAY, December 13, 2024.
If you restart your server, a router error will occur which results in delivery failures due to a routing loop. Mail rules will also start failing. This is a date/time issue in our code, and we will provide a hotfix as soon as possible.
Sounds like an ancient landmine is going off. A hotfix is only to be supplied to customers with support contract.