We're moving and updating backend infrastructure to more resilient towards DDoS and improve the mailing system reputation so that email providers like Tutanota more reliably deliver mail to inboxes.
The nature of the upgrade is likely to impact SSL certs and the mailing system itself briefly. If you have any questions please reach out to the Monero Space Matrix room: https://matrix.to/#/#monero-space:monero.social
I'll post updates to this thread as things are completed.