/etc/logcheck/ignore.d.server/popa3d 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.
1 2 3 4 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ popa3d\[[0-9]+\]: Session from [:0-9a-f.]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ popa3d\[[0-9]+\]: Authentication passed for [._[:alnum:]-]+$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ popa3d\[[0-9]+\]: [0-9]+ messages? \([0-9]+ bytes\) loaded$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ popa3d\[[0-9]+\]: [0-9]+ \([0-9]+\) deleted, [0-9]+ \([0-9]+\) left$
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