How to read/filter email in exchange server 5.5?

[Paddy]

Hi ,

Is there a method to read/filter emails in exchange server 5.5?

For example , if a new mail (outbound) comes to exchange server 5.5, i
need to read the mail and depending on certain conditions , i need to
add a discalimer or do some filtering selectively.

Is there any event or interface which will fire at the server level
when a new mail comes to the server .I did some technical browsing and
got hold of some terms like smtp event sink , CDO , mapi.

I am aware of the OnArrival event in exchange server 2000 but i am
looking for a similar event/functionality in exchange server 5.5

Paddy