22.6 Alphabetized Class Macros | 873
22.6.8 $=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 (?§25.12.12 on page 1154). For
example, the type multipart/ should not be converted, whereas its component boundaryseparated
parts probably should be. Conversion is done by encoding with either quotedprintable
or Base64 (?§24.9.45 on page 1025).
Beginning withV8.7 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.
22.6.9 $={persistentMacros}
Macros preserved in the qf file V8.10 and later
When a message is first accepted, sendmail usually queues it first,* then tries to deliver it.
The qf file contains all the envelope information about a message, including information
specific to the sendmail delivery process, and several macros whose values are important to
preserve between queue runs.
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