cordova-email-plugin
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iOS: isAvailable is true when default Mail app is not installed
iOS 10.2 Cordova 6.4.0
When default Mail app is uninstalled on iOS, system shows the attached screen, and isAvailable is immediately resolved to true. So when user clicks Cancel, cordova.plugins.email.open fails to launch any apps.

so what would your desired behaviour?
If it is possible to detect this scenario on iOS, isAvailable has to be false in this case, because email.open simply fails silently.
maybe the canOpenURL could help to add this feature.