Receive emails

[fabge]

It would be great if django-ses would allow to also receive emails.
As far as I understand it, after setting up SNS, the only thing that is missing is adding another signal analog to the existing ones:

bounce_received = Signal()
complaint_received = Signal()
delivery_received = Signal()
send_received = Signal()
open_received = Signal()
click_received = Signal()

Something like mail_received?

[pcraciunoiu]

Hey, you are welcome to open a pull request for this and test it on your project. I can review the code.