Follow these quick steps depending on your operating system:
MAILTO.
If you prefer using webmail services in your browser instead of a desktop app, your web browser must be configured to allow sites to handle mailto: links.
Browsers block direct links to internal settings. Click any address below to copy it, then paste it into your browser's address bar:
chrome://settings/handlers
edge://settings/handlers
If you are using a different browser, open your browser's Settings, navigate to privacy or site settings, and look for protocol or app handlers.