i pretty sure it doesnt have nothing to do with your host.
as long as you use
[email protected] its good.
as long as you don't use free hosts.
the problem is that in the last month or so, the hun server seems to be a bit jumpy or something, for the confirmation email tking up to 3 - 5 hours to be sent.
but im receiving every email eventually.
if you don't get them at all, then maybe your domains are blacklisted or something.
i would email Hun regarding for this if i where you.