I will install an email server over which you have full control

If you want complete control your emails with custom domain, then look no further. With Mailu, an open-source email software, you can finally run your own email server that can be secured to the highest security standards.

All you need are at least one public IP address, a domain and a server (a virtual private server or a bare metal server works). If you don't already have all of them, don't worry. I will help you get all of them. It costs only as low as 46.76 euros exclusive of VAT per year. You need to pay such fees by yourself.

With the cheapest package, you can create email accounts as many as you want on your domain and its subdomains. Your emails can be accessed from a web browser or any IMAP or POP3 client. The email server supports TLS so it is infeasible to eavesdrop the connection to the server.

Another package comes with a firewall to secure your server from spammers and bots.

With the last package, your email can score 100% on Internet.nl which tests several aspects of the email and domain such as security and anti-phishing. Read more about the test on:

https://internet.nl/halloffame/mail/

If you have any questions, don't hesitate to contact me.