Is there an ISP with email services, maybe not webmail, in the US you would recommend for use on an iMac and iPhone?

[Dervla]

Mine is closing the email portion of their business at the end of next month.

 

[Bigwaff]

Mine is closing the email portion of their business at the end of next month.

Don't know where you live, but where I live in the US, I don't have many choices in ISP (Internet Service Provider). Decouple your email from your ISP. Google Gmail works great in both macOS/iOS email clients and on the web.

 

[aristobrat]

x2 on Bigwaff's suggestions. Decoupling your email from ISP will give you a much wider choice of providers and hopefully keep you from ever having to do this again. I also use Google's gmail and have had no problems with it on iOS or Mac either w/ the native mail client or via webmail. For me, it's best handled the chronic amount of spam my email account gets. If I ever have a problem with gmail, my plan would be explore iCloud more. I have a secondary email account on there, but I haven't used it enough to have an opinion yet.