Content-type: text/plain charset=ISO-8859-1 (for example)Ĭontent-Transfer-Encoding: quoted-printable It should be chosen from the character sets defined by ISO standard 8859. If long lines or up to 25% 8-bit characters are found, the attachment content is text and the character set is determined by the locale. Content-type: text/plain charset=us-ascii Content-Transfer-Encoding: 7bit If only 7-bit characters are found and no line exceeds 140 characters in length, the attachment is ASCII text. Content-type: message/external-body access-type=anon-ftp (Content-Transfer-Encoding: 7bit is assumed.) URL), and the access mode defined in it is anonymous FTP, it is encoded as an external message, and the content of the file (the URL) is copied into the header of the external message. If the attachment is a URL (an attached file with extension. The character set for the attachment is placed in the charset parameter to the Content-type it and the content-transfer-encoding are determined by scanning the entire attachment content. The filename is placed in the name parameter to the Content-type header for the attachment. If MIME is used without TNEF, attached files are sent as MIME message content parts. The TNEF itself is a single, binary attached file named Winmail.dat, encoded as described for MIME without TNEF. If MIME with TNEF is used while encoding message content,all attachment properties and content are in the TNEF stream.
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