This file is indexed.

/etc/logcheck/ignore.d.server/imap 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:]-]+ imapd\[[0-9]+\]: port 143 service init from [^[:space:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ imapd\[[0-9]+\]: command stream end of file, while reading line user=[^[:space:]]+ host=[^[:space:]]+ \[[.0-9]+\]$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ imapd\[[0-9]+\]: Connection reset by peer, while reading line user [^[:space:]]+ host=[^[:space:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ imapd\[[0-9]+\]: Transport endpoint is not connected, while writing text user=[^[:space:]]+ host=[^[:space:]]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ imapd\[[0-9]+\]: No route to host, while reading line user=[^[:space:]]+ host=[^[:space:]]+ \[[.0-9]+\]$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ imapd\[[0-9]+\]: Moved [0-9]+ bytes of new mail to [^[:space:]]+ from [^[:space:]]+ host= localhost \[127.0.0.1\]$