If your email was working fine before and then suddenly it stopped, there's usually a good reason for it. First, if you are seeing error messages, be sure to note these down. Next, it might be worthwhile to delete the account and then set-it up again from scratch. There are a few nuances with every Webhost as far as email settings, so be sure you know what they are. For example, if you host with HE.net, your user ID is your FULL email account (not just your first name).
If problems persist, you'll want to contact your Web host (NOT Webeze). Note that if you wish to contact HE.net, their telephone number is 510-580-4100.