The question and the information provided do not sync with each other. Saying you want a "self-host" email and then asking for an email client is two different

The question and the information provided do not sync with each other. Saying you want a "self-host" email and then asking for an email client is two different things. Although sometimes they come bundled together, what you are looking for is either an email server or a webmail client or both. server: Postfix or equivalent (setup to send and receive) client: roundcube, squirrel, etc.