The C= delivery agent equate (introduced with V8.7 sendmail ) is used to define a default character set for use with the MIME Content-Type : header (Content-Type:). If it is present, its value supersedes that of the DefaultCharSet option (DefaultCharSet). 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 EightBitMode), 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 (Content-Type:). 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. If both are undefined, the value for charset becomes unknown-8bit . |