Error message when enabling module. Email verify has tried contacting the mail host but did not receive a reply. Check with..."

When I try to enable the module I get the following message. I am using Bluehost to run my website. Any ideas on how to solve this?

"Email verify has tried contacting the mail host but did not receive a reply. Check with your hosting provider that the function fsockopen() is properly configured on your server, and that port 25 is open. The module has been disabled."