If you need to remove RMail from Gmail, please follow these steps:

Remove RMail for Gmail Extension

1. On your computer, open Chrome.
2. At the top right, click the 3 dots menu next to your profile icon.
3. Click the option More Tools in the resulting drop down menu.
4. Click the Extensions option from the resulting drop-down menu.
5. Locate the RMail for Gmail extension panel and either disable the toggle button or remove the extension.