Visit your Internet Service Provider’s (ISP) website. This is the website for the company who provides you with internet connectivity and email services. Note that this method works for people who use the email address assigned by your ISP and won’t be helpful for web-based email users (like Hotmail or Gmail).
For example, if you use an email address provided by Comcast Xfinity (for example, yourname@comcast.net), go to http://www.xfinity.com. Centurylink users would visit http://www.centurylink.com.
There’s a chance your ISP doesn’t provide email addresses to its users. Their website should tell you either way.