Greetings ninja_ninja,
Thanks for visiting the Apple Support Communities! It seems Google Chrome doesn't open the default mail app as expected.
Check out how to set the default mail app in the article below, and reach out to the app developer for further assistance if the issue persists:
Change the default web browser or email app on your iPhone, iPad, or iPod touch - Apple Support
- Go to Settings and scroll until you find the third-party app.
- Tap the app, then tap Default Mail App.
- Select an email app to set it as the default. A checkmark should appear next to the email app to confirm it's the default.
If you want iOS Mail as your default email app, but you previously deleted it, you need to restore it. Go to the App Store and search for Mail. Then tap the Restore button
. Wait for the app to restore, then open it from your Home Screen. Follow the steps above to set iOS Mail as your default email app.
If you don't see the option to set a third-party email app as the default, the developer might not support it. Contact the app developer to learn more."
Kind regards.