For those of you who have been using Dolphin for a while, you will remember that Boonex used to offer a free RMS hosting service for it's free licenses. This service has long since been discontinued, leaving users to either ensure that they find a combined Web / RMS hosting package, or look for a third party RMS host.
Smoge over at ModMySite, has recently introduced a free RMS hosting package on their own servers, for small low bandwidth sites. There are also a variety of paid packages that should support all sizes of sites from small to large.
ModMySite, are a long time Dolphin support site that has been around since the original days of AEDating, way back in 2003, so they certainly know their stuff.
If you're interested in ModMySites RMS services, click HERE