To set SmarThru as the default one for email addresses, simply follow the guide:
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For Windows 7: Go to Start and type default programs. Wait for the option to appear, then locate the mailto:// option in the list. Double click it and assign the SmarThru as the default email.
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For Windows 10, go to Start and type default then click on Default app settings. Click on Email and choose Smarthru from the list.