[ADMIN] Upgraded server

Over the weekend I upgraded the mail server from Ubuntu 18.04 to 20.04, and there have been some issues with mis-matched versions and libraries. If you have tried to send a message in the last few days, please check the archive (https://leafe.com/archives) to verify that it was posted.

I *think* I have all the kinks worked out, but please let me know off-list about any problems you run into.

— Ed