Upon switching over to Cloudflare, the mail server that I have set up with PostFix and Dovecot stops working. By "stops working", I mean that I am no longer able to send or receive mail from my Thunderbird client. As ...

If so, please explain to me how you were able to do it. When I run either of the following: sudo a2enmod mod_http2 sudo a2enmod http2 I receive the following respectively: ERROR: Module mod_http2 does not exist! ERROR...