[Dovecot] Performing an action on mail receipt

Dear all,

I would like to perform an action for certain users each time a mail arrives via LMTP. I would like to send an email notification to an external email address when new mail has arrived for certain users (note: not a forward).

I am assuming that creating my own plugin using the existing "notify" plugin is the way to go. However, before I go down that route, I'd like to check that is the best approach? Or would it be better to perform this sort of thing before the mail reaches Dovecot?

Assuming writing a plugin is answer, do they have to be written in C?

Dovecot version: 2.1.7

Thanks,

Andy