Hello. We published open-source, simple and easy to use .NET Standard 2.0 library with some useful utilities. For example, you can now easily check if email address is temporary / disposable. With string extension methods this can be as easy as following: bool isTemporary = “username@mailinator.com”.IsTemporaryEmail(); //true Current implementation is offline (known temporary domains are “baked in”) and for this reason also very fast. GitHub repository with examples: https://github.com/AppBeat/AppBeat.Utils Our official NuGet Package for this library: https://www.