/etc/logcheck/ignore.d.server/pysieved is in pysieved 1.1-0.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pysieved\[[[:digit:]]{1,5}\]: Connect from .*$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pysieved\[[[:digit:]]{1,5}\]: Disconnect$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ pysieved\[[[:digit:]]{1,5}\]: Authenticated user .*$
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