I've made changes for amavisd-new rules which may be useful for others too

Following line is my modified one. Original one is found at line one in /etc/logcheck/ignore.d.server/amavisd-new.

^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ amavis\[[[:digit:]]+\]: \([-[:digit:]]+\) Passed CLEAN,( \[[.:[:xdigit:]]+\]){0,2} <[^>]*> -> <[^>]*>(,<[^>]*>)*, Message-ID: <[^>]+>( \((added by[^)]+|sfid-[_[:xdigit:]]+)\))?,( Resent-Message-ID: <[^>]+>,)? mail_id: [-+[:alnum:]]+, Hits: ([-.[:digit:]]*)+, size: [[:xdigit:]]+, queued_as: [[:xdigit:]]+( OK id=[-[:alnum:]]+)?(, dkim_id=[^,]+)?, [[:digit:]]+ ms$

With this rule I get messages filtered with dkim header signatures - and also accept messages with positive numbers in "Hits: " part. I made these changes because they occur very frequently on my mailsystem.

Hope it helps somebody else...