This file is indexed.

/etc/logcheck/ignore.d.server/exim4 is in logcheck-database 1.3.16.

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

The actual contents of the file can be viewed below.

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^[-0-9]{10} [0-9:]{8} (Start|End) queue run: pid=[0-9]+$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ Completed$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ [=-]> [_[:alnum:]-]+ <?[@._[:alnum:]-]+>? R=local_user T=mail_spool$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ [=-]> [@._[:alnum:]-]+ <?[@._[:alnum:]-]+>? R=dnslookup T=remote_smtp H=[._[:alnum:]-]+ \[[.0-9]{7,15}\]$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ [=-]> [@._[:alnum:]-]+ R=dnslookup T=remote_smtp H=[._[:alnum:]-]+ \[[.0-9]{7,15}\]( X=TLS-1.0:RSA_AES_256_CBC_SHA1?:32)?$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ <= [@._[:alnum:]-]+ U=[_[:alnum:]-]+ P=local S=[0-9]+( id=[^[:space:]]+)?$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ <= [@._[:alnum:]-]+ H=[._[:alnum:]-]+ \[[.0-9]{7,15}\]( U=[_[:alnum:]-]+)? P=esmtp S=[0-9]+ id=[^[:space:]]+$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ <= <> R=[_[:alnum:]-]+ U=[_[:alnum:]-]+ P=local S=[0-9]+$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ <= <> H=[._[:alnum:]-]+ \[[.0-9]{7,15}\] P=esmtp S=[0-9]+ id=[^[:space:]]+$
^[-0-9]{10} [0-9:]{8} SMTP command timeout on connection from [._[:alnum:]-]+ \[[.0-9]{7,15}\]$
^[-0-9]{10} [0-9:]{8} [-[:alnum:]]+ == [@._[:alnum:]-]+ <?[@._[:alnum:]-]+>? R=dnslookup T=remote_smtp defer \(-53\): retry time not reached for any host$