Please help us to help you:
Are you using a web-based email service (where you send and receive email via a website accessed from your web browser, such as Internet Explorer, Firefox or Chrome) or a dedicated email client (such as Outlook Express, Thunderbird or Windows Live Mail)? Which email service do you use? (i.e. what comes after the @ symbol in your email address?). Are you using a computer or a mobile device (such as a tablet or phone)?
Without the answers to those questions we'll have little chance of being able to help you, so please post again (on this thread) to let us know how you're trying to access your email.