CharsetDecoder provides a replacement decoder for mime.CharsetDecoder, which can decode a wide range of rare and unusual character sets.

CharsetEncoder provides a replacement encoder for mime.CharsetEncoder, which can encode a wide range of rare and unusual character sets.

GenerateBoundary will generate a random MIME boundary that is probably unique in most circumstances.

GenerateSafeBoundary will generate a random MIME boundary that is guaranteed to be safe with the given corpus of data.