The F=z delivery agent flag (?§20.8.52 on page 783) tells sendmail
to deliver using the LMTP protocol.
20.5.3 C=
Default MIME character set V8.7 and later
The C= delivery agent equate (introduced withV8.7 sendmail) is used to define a default
character set for use with the MIME Content-Type: header (?§25.12.12 on page 1154). If it is
present, its value supersedes that of the DefaultCharSet option (?§24.9.31 on page 1000).
Note that the C= delivery agent equate is examined only when the delivery agent is selected
for an envelope sender address.
When a mail message is converted from 8 to 7 bits (see the EightBitMode option in ?§24.9.45
on page 1025) it is important that the result looks like a MIME message. V8.7 sendmail first
outputs the following header (if one is not already present):
MIME-Version: 1.0
Next, V8.7 sendmail looks for a Content-Type: header (?§25.12.12 on page 1154). If none is
found, the following is inserted, where charset is the value declared for the C= delivery
agent equate of the sender??™s delivery agent:
Content-Type: text/plain; charset=charset
If the argument to C= is missing, the following error is printed and C= becomes undefined:
mailer agent_name: null charset
If the C= delivery agent equate is undefined in your configuration file, charset defaults to
the value of the DefaultCharSet option.
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