notify sieve and quota the second please

[aa]

Hello,
 i would like generate a script was infowm any users if there mailboxes over
 quota.

 Could i use the notifyd?
 could i use a sieve script in the user-sieve-home?

 Please could any say how have i to write this script?
 The sieve and notify-doku isn't enough and say nothing about how can i
check
user-quotas with sieve scripts?

 Thank's a lot for any help

> Best reagards
>
> Achim