[JDEV] Inbox mail notification feature

[Ganbold]

Hi,

I'm new to jabber development and I have some questions.
I would like to implement inbox mail notification feature in existing 
jabberd-1.4.2 server.
We have written custom web mail server in PHP and backend database is 
mysql. All incoming mails are stored in mysql database.

In my opinion there might be 2 possibilities.
One is email receiving program (perl script) should notify jabberd using 
<headlines/> tag about new incoming mail.
Second possibility is xdb_sql should check new mail by querying time by 
time from mysql database.

So can somebody suggest me some solution for this? Did anybody solve this 
before?
Also from where should I begin developing the code? I mean, from which part 
of the jabber source codes or xdb_sql source codes should I begin?
Did somebody developed this kind of code before?

TIA,

Ganbold