yes for another 450$ and that is kind of steep for a nerd and his girlfriend...
So's a dedicated Mac box, when you get right down to it. A slice or a vhost or gmail is cheaper, and you don't have to deal with local connectivity and networking issues and UPS and related baggage, and you can do a push off of these or a gmail or such.
There are also ways to generate an SMS, for instance, for incoming mail messages, if you want to integrate your own notification code.
I've not understood the fascination with push notifications. (But then I date back to the era when gateways were gateways and mail could get delayed, and you needed to know bang-paths to decvax was in order to route your mail. Uphill. Both ways. In a bit-storm. Yeah, yeah, yeah, blasted kids, get off my hyper-lawn. 🙂 )
But seriously, mail isn't a reliable transport, and it's certainly subject to delays. Use the right tool for the job...