To make Gmail your default email program when clicking on an HTML link like , you need to configure your operating system default application settings alongside your web browser’s protocol handler permissions.
Configuring these settings links the mailto protocol directly to your browser, which then redirects the command straight into your Gmail compose window. Configure Google Chrome
Enable Protocol Handlers: Paste chrome://settings/handlers into your address bar and ensure Sites can ask to handle protocols is toggled on.
Remove Conflicts: If another application is listed under the email section on that same page, click the X next to it to clear it.
Grant Gmail Permission: Open your Gmail account in a tab and click the Service Handler icon (overlapping double-diamonds 🔷) on the right side of the address bar.
Confirm the Change: Choose Allow when prompted by Chrome to let Gmail open all email links. Configure Mozilla Firefox
Open Settings: Click the three-line application menu in the upper right-hand corner and select Settings.
Navigate to Applications: Scroll down within the General panel until you reach the Applications section.
Find Mailto: Type mailto into the section’s search bar to pull up the email action row.
Set Action: Open the dropdown menu next to mailto and switch the action to Use Gmail. Link Windows Settings to Your Browser