Verified answer

I can't stress this enough. The quality of answers that you get are based on quality of questions.

1 What type of email program are you using? Outlook, web based, etc.

2 Are you able to send?

3 How many emails are in your "inbox"

The more information you provide will help us to provide you with a great solution!

That probably means A you have a virus or B you need to delete your inbox. Plus it wouldn't help to delete unneeded files from your computer

what kind of email are you using?

check if you still have available space.

try sending emails to yourself.