/usr/share/doc-base/exim4-filter-txt is in exim4-base 4.76-3ubuntu3.
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Title: Exim's interface to mail filtering
Author: Various
Abstract: Description of the user interface to Exim's in-built mail filtering facility. This is the text version.
Section: Network/Communication
Format: text
Files: /usr/share/doc/exim4-base/filter.txt.gz
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