[DRE-maint] Bug#1068333: schleuder: keywords in the middle of messages get stripped

[Georg Faerber]

Package: schleuder
Version: 4.0.3-7
Forwarded: https://0xacab.org/schleuder/schleuder/-/issues/535
Tags: bookworm fixed-upstream upstream

Sometimes, a user of a schleuder list might send instructions about how
to control a schleuder list in a message that went to the list itself.

If the instructions include keywords, those keywords are stripped before
re-sending, even if those keywords are not at the top of the message.