> So, If a new message comes in through SMTP and is stored in 
> database, how are the IMAP client informed about the new messages.

RFC 3501:
- 6.1.2. NOOP Command
- 6.3.10. STATUS Command
- 6.4.1. CHECK Command
- 7. - 7.5. Server Responses

Some Books:
- O'Reilly Mailmanagement with IMAP (Mullet & Mullet)
- O'Reilly Programming Internet E-Mail (David Wood)
(They are not perfect - but they give you a good start in "How IMAP works")

> Is it handled through database triggers.
Nope

HTH
--
Wolfram

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