I think the following line is missing in BodyStructureParser.cs on line 152 :
_reader.Read(); // Read '(' of envelope
Just before _reader.Read();
Comments: ** Comment from web user: pavel_azanov **
_reader.Read(); // Read '(' of envelope
Just before _reader.Read();
Comments: ** Comment from web user: pavel_azanov **
Thank you! I added the missing read operation, check the latest source code for the update.
Greets,
Pavel