[Dovecot] Delivery notifications

[Brandon Keepers]

I'm working on an application that is backed by Postfix 2.3.8 and  
Dovecot 1.0.13, configured with virtual domains, for handling messaging.

I need to be able to send the notification (such as "You've received a  
new message on SomeAwesomeService. Click here to check it out", It's  
evil, I know) to a different email address, such as a mobile device.  
Eventually, we want to do other things like clear web page caches when  
a message is received, or sending IM notifications, but that's for  
another day.

So basically, we want to notify our application whenever a new mail is  
received, and it can do all the magical things that it needs to do.

I was hoping to get some feedback on the different approaches I'm  
looking at. From what I can tell, there's not a way to deliver to  
multiple virtual transports in postfix, so here's the options I see:

* Content filter
I could set up a "content filter" that just delivers the mail to the  
application, and then re-injects it back into postfix. This seems like  
more work than the other options just because I have to worry about re- 
injecting the message

* Intercept delivery
Replace the dovecot deliver command with a custom one that calls the  
dovecot deliver and then passes the message on to the application.   
I've written a little proof of concept for this and it seems to work,  
but just seem shady.

* Sieve
Dovecot supports Sieve, so I could just have a global sieve script  
that sends the notifications.  This is definitely the solution I'm  
leaning towards.

Are there any better options? Do you think this will have a  
significant impact on performance? Am I crazy?

Thanks,
Brandon
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