While migrating away from gmail servers is one matter, the main thing keeping me on Google's service is Inbox. It's quite simply revolutionised the way I deal with my mail, and I can't really come to terms with using a traditional mail client again.
If I were to switch to some IMAP-providing alternative to gmail servers, is there a frontend product I can use that gives me an Inbox-like experience on the frontend? My requirements are:
* Bundling of newsletters with no notifications, pinning
* Snoozing
* Undo send (delayed sending)
* Good search
* Cross platform
Nice to have:
* Open source
* Notification sync
* Attachment preview
