Behavior when mailbox limit is reached

[Mullis, Josh (CCI-Atlanta)]

Hello,

Is there a way to configure postfix to remove old mail when the mailbox size 
limit is reached instead of new mail being rejected?
The basic need is limiting the amount of disk space mailbox files are using 
without rejecting mail.

We have a default postfix install via RHEL 5/6 rpms (version 2.3.3) only used 
for local user mail.
The user mailboxes are single mailbox files under "/var/spool/mail/<user_name>".


Thanks!
-josh