Did you try setting an email account in Options or Preferences?
- Go to Options -> Other -> Email Settings...
- I suggest use SMTP to send email directly to the mail server
Set up an account. SMTP mail host and account details are subject to the email provider.
Here is more on this: http://www.nch.com.au/kb/10018.html
- Once done, click OK.
Try sending email and see if it works.