Email Services
AnonAddy (free, open-source anonymous email forwarding service)
Firefox Relay (masks your true email address from public view)
Namecheap (They host business emails.)
Proton (One Proton account gives access to ProtonMail, ProtonVPN, Proton Calendar, and ProtonDrive. They also have Proton Pass and SimpleLogin.)
ProtonMail Bridge (“An application available to all paid users that enables the integration of your ProtonMail account with popular email clients, such as Microsoft Outlook, Mozilla Thunderbird, or Apple Mail.”)
SimpleLogin (email aliases; powered by Proton)
Startmail (same company that built the Startpage search engine)
Vivaldi (web browser that includes email)
Zoho (They also have a Notepad alternative.)