A simple yet rigorously correct .NET library for validating email addresses according to RFC 5322 and Internationalized Email standards (RFC 653x). The core is a hand-written character-by-character parser that rejects invalid syntax while supporting quoted strings, IP literals, international characters, and length constraints per the spec. It provides a static `Validate`/`TryValidate` method and a DataAnnotations `EmailAttribute` for easy integration into ASP.NET or other validation frameworks. The library is well-tested with hundreds of valid and invalid examples, including edge cases like surrogate pairs and maximum-length addresses. It targets multiple .NET frameworks (net462, net8.0, net10.0, netstandard2.0/2.1) and is distributed as a NuGet package with signed assemblies. The code is clean, well-commented, and free of external dependencies for the core validation, making it a trustworthy component for any .NET application needing email input validation.