IMultipartAlternative Interface

public interface IMultipartAlternative : IMultipart, 
	IMimeEntity, IDisposable, ICollection<MimeEntity>, IEnumerable<MimeEntity>, 
	IEnumerable, IList<MimeEntity>

A multipart/alternative MIME entity contains, as one might expect, is used to offer a list of alternative formats for the main body of the message (usually they will be "text/plain" and "text/html"). These alternatives are in order of increasing faithfulness to the original document (in other words, the last entity will be in a format that, when rendered, will most closely match what the sending client's WYSISYG editor produced).