I created an implementation for sending an email. In iOS I can check if I can send an email with MFMailComposeViewController.CanSendMail. I can't find a similar command for Android.
Use the Xamarin.Plugins.Messaging plugin.https://github.com/cjlotz/Xamarin.Plugins/tree/master/Messaging
It has features to check if you can send SMS, Emails and Phone calls.
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