I’m about to migrate and merge the mail services of the Orekit and Hipparchus projects onto a new infrastructure. While I’m migrating the various components of this service, and while the information is being propagated in the DNS, mail sending will be severely disrupted, probably until tomorrow.
The main impact for you will undoubtedly be the absence of notification of new forum posts.
I migrated our mail service to a new server last Friday, but the information (i.e. DNS records) seems to be taking a while to propagate and some SMTP servers are still refusing to deliver mail at the moment (this is particularly the case with GMail servers). So don’t be surprised if you stop receiving notifications from the forum and forge. Everything should be back to normal in the next few days.