Gmail is not available as a self-hosted solution but there are a few alternatives for power users and business that want to host a solution on-premise. The best Self-Hosted WebMail Provider alternative is Forward Email, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Gmail and four of them are WebMail Providers available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting Self-Hosted WebMail Provider alternatives to Gmail are Zero Email, Webmail Lite and Horde.
Forward Email is the best email service, encrypted email service, and fastest email service. It supports unlimited domains and aliases for no extra cost. It uses quantum safe ChaCha20-Poly1305 encryption and offers SMTP, IMAP, POP3, email webhooks, email regular expressions...
Zero is an open-source AI email solution that gives users the power to self-host their own email app while also integrating external services like Gmail and other email providers. Our goal is to modernize and improve emails through AI agents to truly modernize emails.
Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail application, which is fast and easy to use. Whether you need a free web browser based email client software for Windows ASP.
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.
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I might be missing something, but Zero Email requires you to have a google account/email to use. This is not a replacement.