F9

F=9

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Convert 7- to 8-bit if appropriate

V8.8 and above

The F=9 delivery agent flag causes the MIME message body of a delivered message to be converted back from either quoted-printable or base64 into its original 8-bit form. The F=9 delivery agent flag is effective only if sendmail was compiled with MIME7TO8 defined (MIME7TO8).

Conversion works only on single-part MIME messages. If the Content-Type : header is other than text/plain , no conversion is done. Otherwise, the Content-Transfer-Encoding : header is examined. If the Content-Transfer-Encoding : header type is base64 , conversion is done from base64 to 8-bit. Otherwise, if the Content-Transfer-Encoding : header type is quoted-printable , conversion is done from quoted-printable to 8-bit. If the Content-Transfer-Encoding : header type is neither , no conversion is done.