Email recyling

Hello everyone.

I would like to know if **StartMail**, **Skiff Mail**, **Runbox** or **Disroot** recycle email addresses and aliases, once they're deleted by the user or by inactivity. Also if such info is found somewhere (e.g. T&C, privacy policy, forums...), it would be nice to know a source, because I couldn't find any (reliable).

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