When you’re on a shared server it’s important to find out if anyone else on your server has been blacklisted for spamming.
Because on a shared server you’re IP address and their IP address will be the same, and it does not matter if your domain name is different, you’ll still be blacklisted along with every other person on that server.
If you’re building an email list this will affect how your email gets handled by the major ISP… probably banned.
One way to check and make sure you’re not getting blacklisted is to look up your IP address that your site is hosted on here:
That will tell you what’s going on with your shared server. If it’s got a lot of listings you might want to find a another host before attempting to build an email list.