Mail notification system with cyrus

[Do Duc Huy]

Hi all, can you help me?
I 've used postfix and cyrus for my email system. Now, I want to create a mail alert system to notice user when they have new mails. I 'll create a deamon run in mail server and user 'll have a client running in their system. But now, I don't know how to get exactly information about new mail comming in email system. I 've used two solutions below but each solution still have some weeknesses.
 
1. The first solution, my deamon will connect to imap server and get information about new email for each account. This solution give correct information but it make system to slowly.
2. The second solution, I use forward method of postfix and forward a copy of new email to alert server. This solution is greate, but some time, the information I have was not correct, for example, when an account was over quota, there was no new email can be received but the coppy one still forward to my deamon, so the deamon notice user "you 've got new mail" while nothing "new" in his mailbox.

Does any one have another solutions for this system. Thanks for any idea and instruction

-- 
Do Duc Huy 
Centre for Development Infomation  Technology - CDIT
The 4th floor VCCI buiding #9 Dao Duy Anh Str. Dong Da Dstr. Hanoi
Tel: 84-04-5742879
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