Best email reseller partners?

I know it's been asked here before, but I can't find any threads that are less than a few years old.

**What are the best companies to partner with as an email reseller?**

I work at a digital agency and we offer email accounts with our website packages. We've been using IONOS, but we recently had an incident where they lost an entire inbox worth of client emails. We can't risk that happening again, so we're looking for alternatives.

We need a partner who can provide reliable service at a decent price. It would be a plus if they offer an archiving service. It would also be nice if we could create sub accounts and give each of our clients an admin account that would let them manage the inboxes on their domain.

My short list so far is:

**Rackspace** \- I've heard mixed reviews, but they're one of the biggest players in the field and their prices seem reasonable for what they offer.

**Intermedia** \- Only offer Hosted Exchange accounts, which might be overkill for our clients, but I like their archiving and admin sub account offerings.