$=n
Don’t encode these Content-Types V8.7 and later
Although some MIME content types can be converted to 7
bits, not all types should be. Content types are
defined by the Content-Type: header (Content-Type: on page 1154). For
example, the type multipart/ should not be converted,
whereas its component boundary-separated parts
probably should be. Conversion is done by encoding
with either quoted-printable or Base64 (EightBitMode on page 1025).
Beginning with V8.7 sendmail,
types that should not be encoded are those defined
as members of the class $=n. When sendmail
first starts to run, it defines the following list
of values for class $=n:
multipart/signed
As of V8.10, no other useful values exist for this class.
Note that a type in class $=n can still be prevented from being
encoded based on the considerations imposed by class
$=e. Also note
that the actual encoding can be restricted to
quoted-printable by use of the class $=q.
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