[robcohen]

They are using Mailcow, so no, your emails are not encrypted.

In general, unless you're using PGP, email is not reasonable to assume that it's encrypted ever. I use Protonmail, and I still don't trust it at all.

[nilespotter]

Indeed they are encrypted [1], just not with user-supplied credentials.

[1] https://docs.mailcow.email/manual-guides/Dovecot/u_e-dovecot...