One of the key differences between your solution (and fut.io, followup.cc) and our snooze is that we also do the conditional "but don't bring this back if there's a reply on this thread". Along with being able to "snooze" an email you're sending out with the conditional. This brings us much more in line with Boomerang's main functionality.

Plus our snoozing functionality is 100% free, no matter how many you schedule, or how long it's for :)

Oh, and you can see/edit/manage your snoozed emails all from right within Gmail.

And we also have the "Awaiting Reply" view that doesn't require you actually DO anything, other than send out emails. We show you a custom list of the last 20 emails you've sent that don't yet have a reply.

edit: added more about what features we have

fyi: fut.io will send you an email asking if you want to cancel the followup if there's a reply on the thread. I think the follow up email has to be replied to, though.

And a competitor to you would be Follow Up Then which does what you do, I think. (http://fut.io/) I've used it for a very long time, but just switched to the snooze button in Streak. It's slick.

There is also our product, FollowUp.cc (https://followup.cc). We've been around for a little over 7 years!

I couldn't image handling email without a service like this, so I've built one as my first out-of-Codecademy project. I'm kinda proud that it works!

Free to use: http://www.pfalke.com Open source: https://github.com/pfalke/returnx

Any chance your project is open source? I would do this to something like 2 emails a year, but I'm intrigued by how it works from the technical aspect. Is there a database, or just exim/postfix magic?

Sorry I'm super dumb :( what does 'snoozing' your email mean?

Hide it for the desired time, and then show up again as unread.

and here I am thinking that it meant "send this email later"...

We have that too :)

interesting