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Why is IETFHDR incompatible with (for instance) subject tags?

April 26, 2017incompatible instance Subject Tags

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Why is IETFHDR incompatible with (for instance) subject tags?

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The IETFHDR subscriber option was added in LISTSERV 1.7b (November 1991). IETFHDR demands strict compatibility with IETF standards for mail, which impose a very strict set of rules on LISTSERV: LISTSERV MUST add a “Received:” field to the message as it passes through the server; LISTSERV MUST add a “Message-ID:” field if it is missing; LISTSERV MAY add a “Sender:” field if desired; No other changes of any kind to the email headers are allowed. If IETFHDR is specified, these rules prevent LISTSERV from appending subject-tags and/or making other modifications to the email headers. Those interested in the history of the IETFHDR option may wish to review the following LSTSRV-L postings: http://peach.ease.lsoft.com/scripts/wa.exe?A2=ind9611&L=LSTOWN-L&P=R10241 http://peach.ease.lsoft.com/scripts/wa.exe?