Good Email Provider With Custom Domain 4 Iphone?

Hello All,

I have a POP-Imap email on my domian (example; john@johndoex.com) that I access with Mac Mail. I need to find a different email provider as my current hosting provider (who I have my email thru) has had one server attack after another for months on end.

I will be getting the new Iphone shortly, can anyone suggest a good-solid email provider (that allows a custom domain) which I can utilize with current Iphone & Mac Mail please? I'm currently looking at Gmail for business.

Thanks In Advance,

JD