/usr/lib/thunderbird-11.0.1/isp/POPFile.sfd is in thunderbird 11.0.1+build1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | version="9"
logging="yes"
name="POPFileYes"
enabled="yes"
type="17"
action="JunkScore"
actionValue="100"
condition="OR (\"X-Text-Classification\",begins with,spam)"
name="POPFileNo"
enabled="yes"
type="17"
action="JunkScore"
actionValue="0"
condition="OR (\"X-Text-Classification\",begins with,inbox) OR (\"X-Text-Classification\",begins with,allowed)"
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