You can make Newton the app that opens when you tap or click an email address link. On iPhone and iPad you choose it in the Settings app, on Android you pick it when you open a link, and on a computer Newton sets itself up when it starts.
Steps
iPhone & iPad
Open the Settings app on your iPhone or iPad.
Tap Apps, then Default Apps.
Tap Email and choose Newton Mail.
On iOS 17, scroll down in the Settings app, tap Newton Mail, then Default Mail App, and choose Newton Mail.
Android
Tap an email address link in any app.
When Android asks which app to use, choose Newton Mail and tap Always.
If another app opens without asking, that app is set as the default. Clear its default in your phone's settings, then tap the link again.
Desktop
Open Newton. Each time it starts, it makes itself the app for email links if it isn't already.
Click an email link on a web page or in another app. A Newton compose window opens with the address filled in.
If links still open another app, choose Newton for email (mailto) links in your computer's default apps settings.
Good to know
If the link includes a subject, CC, BCC or message text, Newton fills those in too.
On your phone, email links inside emails you read in Newton always open a new email in Newton.
On a computer, Newton makes itself the app for email links again every time it starts, even if you picked another app since.
On Android, you can also share text from another app to Newton to start a new email.