This file is indexed.

/etc/logcheck/ignore.d.server/horde3 is in logcheck-database 1.3.18.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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^\w{3} [ :0-9]{11} [._[:alnum:]-]+ .+\[[0-9]+\]: \[horde\] Login success for [@._[:alnum:]-]+ \[[.0-9]{7,15}\] to Horde \[on line [0-9]+ of ".+"\]$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ .+\[[0-9]+\]: \[horde\] User [@._[:alnum:]-]+ \[[.0-9]{7,15}\] logged out of Horde \[on line [0-9]+ of ".+"\]$