Can you selfhost? Does you ISP allow you to host a mail server? (and there is a difference between what they say, and what they actually do.)
I use iRedMail as a complete solution which is a mailserver, complete with server management and webclients sogo and icube.
The problem you may run into is if your ISP actively submits its customer email subnets to sites like Spamhaus. But if you dont get IP changes very often this might not be a problem. However you do also need to have a domain in your control and know how to do DKIM and SPF