The Body object gives you access to the textual body parts of an email.
A String containing the body text. Note that HTML parts will have tags in-tact.
The header of this MIME part. See the
Header Object for details of the API.
Any child MIME parts. For example a multipart/alternative mail will have a main body part with just the MIME preamble in (which is usually either empty, or reads something like "This is a multipart MIME message"), and two children, one text/plain and one text/html.