Bouncing email is a potential spam launch point.
spammer die for server which allow cacth-all
dont do it..
dont worry about people who misaddressed they will get bounce and if they really intrested to send you email they will find correct email somehow.
cacth-all is a much worse problem moreover it will not deliver to the correct account..it will delivery all misaddressed to 1 box, which iam sure will get thousands of spam a day once spammers know..give and take 1 week
Dedicated & Shared Zimbra Hosting Provider