Once you know that a service like this exists you want it. I won't sign up, because I am unsure about giving another company access to my mail account. Do you know about a similar solution that can be run on an own server?
If you're looking for more robust/common software take a look at the "mpack" package of tools.
Syncing to dropbox is left as an exercise, but presumably you'd just configure your attachments to be saved into the magic folder, perhaps on a per-suffix basis. (e.g. ~/shared/attachments/jpg/foo.jpg)
I don't know of any solution that can be run on your own server, but that's a valid concern. Since I developed this product, I can tell you that we don't store any attachments and our communication with your email is fully encrypted.
e.g. I wrote this quick hack recently https://gist.github.com/skx/ba07ba7fbb0788c6ba68
If you're looking for more robust/common software take a look at the "mpack" package of tools.
Syncing to dropbox is left as an exercise, but presumably you'd just configure your attachments to be saved into the magic folder, perhaps on a per-suffix basis. (e.g. ~/shared/attachments/jpg/foo.jpg)