Emailto: links are not handled by eM client

[Gary]

@AZgo

On Windows 10

It is because eM Client has not been set as the default.

1. Open your Windows Settings > Apps > Default Apps.
2. Scroll to near the end and select Set Defaults by App.
3. Select eM Client and choose Manage.
4. Select the Mailto option, and set it to eM Client.