Symbiosis: Package d-push for stretch?
d-push was removed from debian before stretch because it wasn't php7 compatible in time. It is now compatible with PHP7, so we could choose to package it ourselves.
We should determine if anyone actually uses d-push to sync emails to their mobile device and how important it is to them - i.e. whether or not they can just use IMAP instead.
I'd be very surprised if anyone was unable to use IMAP. We're talking early 2000s MS stuff here I'd expect.