Are there .NET Framework methods to parse an email (MIME)?

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I know you said no external libraries, but I have a library posted on codeplex:

https://bitbucket.org/otac0n/mailutilities

MimeMessage msg = new MimeMessage(/* string, stream, or Byte[] */);

It has been tested with over 40,000 real-world mail messages.

I’m not too happy with my namespace choice, but… I’m too lazy to change it.

PS:

Internally, my library uses these regexes as a parser:

internal static string FullMessageMatch =
    @"\A(?<header>(?:[^\r\n]+\r\n)*)(?<header_term>\r\n)(?<body>.*)\z";
internal static string HeadersMatch =
    @"^(?<header_key>[-A-Za-z0-9]+)(?<seperator>:[ \t]*)(?<header_value>([^\r\n]|\r\n[ \t]+)*)(?<terminator>\r\n)";
internal static string HeaderSeperator =
    "\r\n";
internal static string KeyValueSeparator =
    @"\A:[ \t]*\z";

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