Hosting
I personally like HostGator for hosting. The cpanel is easy to navigate and it is easy to load wordpress through fantastico. It is also easy to forward an email address. I have a link in the sidebar to HostGator.
Autoresponder
There are hundreds of autoresponders. One of the most popular is Aweber. It is fairly easy to use and very consistent. With our help your marketing message will be presented to your clients consistently. The link is in the sidebar.
Domain Name Registration
I really Like “1 and 1″. Mainly because it is inexpensive and they have an auto-renewal. This makes it a set it and forget it. I have domains registered with other companies that do no auto-renew and the site has gone down because we forgot to renew it. We Recommend 1&1 for Domain Registration. 1 and 1 also provides hosting, but I have not used it.
I am an affiliate for these services because I use them myself and I believe these are some of the best.