Mark Sapiro - 2007-01-13

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Mailman is not doing this unless the original message contains alternative parts and content filtering is removing the part with <x-flowed></x-flowed> tags.

Under some circumstances, Mailman will remove an RFC 3676 Format=Flowed parameter from the Content-Type: header. This is bug #1495122 <https://sourceforge.net/tracker/index.php?func=detail&aid=1495122&group_id=103&atid=100103>.

If some MTA/MDA/MUA is generating the <x-flowed></x-flowed> tags from the Format=Flowed parameter, then Mailman could be indirectly responsible.