Accessible Email?

You know the way i am volunteering at
The Cedar Foundation?
Well the client that i am teaching at the moment is going to be moving on to email soon. I was just wondering if there are any accessible email providers, where even the sign up will be easy?

I currently use
Which is good, but is slightly cluttered. I can navigate around it on the website, but this person might feel it’s too cluttered.

I know that
G Mail
Has a capcha, as well as
Are there any ones that don’t have a capcha? What one would you recommend for a beginner?

Thanks guys.