Postfix configuration question

[Tarjei Huse]

Hi,

After upgrading to Postfix 2.0.6 I'm having problems posting to Cyrus 
Imapd shared folders. the reason is explained in the Postfix faq as 
beeing because Postfix does not post to unknown users. (see 
http://www.postfix.org/faq.html#bogus).

I quite like that feature, as it reduces the amount of spam that comes 
into the rest of the system, however I would like to be able to post to 
some shared folders (and subfolders thereof) using the 
+folder.otherfolder at domain.com syntax.

Does anyone have an idea on how to solve this?
Tarjei