Ask HN: FastMail Alternative with Reseller Option?

Hi,

I've been with FastMail for over a decade, & up until now have had zero complaints.

However I'm currently experiencing a problem which their support hasn't been able to solve now for coming up on 3 weeks. It's causing such major problems with running my freelance business that I'm considering taking my business elsewhere from here on.

What other email services are there, which explicitly allow the resale of their servives, such as FastMail does?

-c

EDIT:

I see that RackSpace is a contender in this circumstance. Do they have any happy resellers here on HN, & (as a bonus) has anyone left FastMail for RackSpace & been happy with the decision to do so?