I have fetchmail running, it's slow, but I'm getting all of my emails delivered (I have a forward to protonmail to compare).
EDIT: I don't have visibility for emails not forwarded during the initial outage so nothing before 07:30 UTC yesterday.
My mail has been coming in slowly since 30 minutes ago.
I am going to give the mail some time to arrive, and then I will migrate my mail to mailbox.org instead.
Some deliveries will be retried, but after 30+ hours some will have permanently failed.