class Mail::StructuredField

:nodoc:
bodies is given along with their syntax.
described in section 2.2.3. Semantic analysis of structured field
characters are subject to header “folding” and “unfolding” as
(together known as the white space characters, WSP), and those WSP
ASCII value 32) and horizontal tab (HTAB, ASCII value 9) characters
comments (as described in section 3.2.3) as well as the space (SP,
are allowed (according to their syntax) to be introduced or end with
described in sections 3 and 4 of this standard. Many of these tokens
Structured field bodies are sequences of specific lexical tokens as
described above. These are referred to as “structured” field bodies.
structure more restrictive than the unstructured field bodies
Some field bodies in this standard have specific syntactical
2.2.2. Structured Header Field Bodies
===Per RFC 2822:
Provides access to a structured header field