25.7 Headers and mc Configuration

V8 sendmail offers a number of m4 macros for use in your mc configuration file that deal directly with headers. They are shown in Table 25-4.

Table 25-4. Header-related mc macros

Macro	§	Sets What
confFROM_HEADER	From:	Define the format for the From: header
confRECEIVED_HEADER	Received:	Define the format for the Received: header
confOLD_STYLE_HEADERS	OldStyleHeaders	Declare the OldStyleHeaders option
confMAX_HEADERS_LENGTH	MaxHeadersLength	Declare the MaxHeadersLength option
confMAX_MIME_HEADER_LENGTH	MaxMimeHeaderLength	Declare the MaxMimeHeaderLength option
confSINGLE_LINE_FROM_HEADER	SingleLineFromHeader	Declare the SingleLineFromHeader option
confUSE_ERRORS_TO	UseErrorsTo	Declare the UseErrorsTo option, which affects the Errors-To: header
confNO_RCPT_ACTION	NoRecipientAction	Declare the NoRecipientAction option, which affects the To:, Cc:, and Bcc: headers
confRRT_IMPLIES_DSN	RrtImpliesDsn	Declare the RrtImpliesDsn option, which affects the Return-Receipt-To: header