This file is indexed.

/etc/logcheck/ignore.d.server/gnu-imap4d is in logcheck-database 1.3.17.

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:]-]+ gnu-imap4d\[[[:digit:]]+\]: Incoming connection opened$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ gnu-imap4d\[[[:digit:]]+\]: Connect from [.:[:xdigit:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ gnu-imap4d\[[[:digit:]]+\]: Error reading from input file: Connection reset by peer$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ gnu-imap4d\[[[:digit:]]+\]: No socket to send to$