Please add the following rule into a file violations.ignore.d/logcheck-dcc:
^\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}$
This will ignore the nightly dccifd reporting line.
Regards,
Joost Cassee