Remove Hard Stop with mail quota

[Moten]

I followed the Ubuntu 8.04 postfix mysql guide here.

Everything is working great, but I wanted to know how to accomplish one other thing.

Instead of a hard stop, we would like to only be notified when a user has exceeded their mailbox limit (already doing this) but still allow them to receive mail.

I am assuming it is somewhere in the main.cf, but not sure where. Thanks for the help!