RTF to HTML Converter (Text/RtfToHtml.cs)

Converts RTF formatted text to HTML for email rendering. Use when processing rich text emails.

// Source: https://github.com/jstedfast/MimeKit | License: MIT | Copyright 2012-2026 .NET Foundation and Contributors
// Provided via justclaw.it.com; keep this notice with the code.
//
// RtfToHtml.cs
//
// Author: Jeffrey Stedfast <jestedfa@microsoft.com>
//
// Copyright (c) 2013-2026 .NET Foundation and Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyrigh

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