This file is indexed.

/etc/logcheck/ignore.d.server/dcc 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:]-]+ dccifd\[[0-9]+\]: [.0-9]+ rejected messages to [0-9]+ targets and discarded messages to [0-9]+ targets among [0-9]+ total since [/0-9]{8} [:0-9]{8}$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dccproc\[[0-9]+\]: DCC servers ([-._[:alnum:]]+ )+\.\.\. at ([:.[:xdigit:]]+ )+
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dccproc\[[0-9]+\]: continue not asking DCC [[:digit:]]+ seconds after failure$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dccproc\[[0-9]+\]: no answer from [._[:alnum:]-]+ \([.0-9]{7,15},[0-9]+\) after [0-9]+ ms$