This problem is usually software related. If you cant get online at all, then you probably cant send email either . Then you should see the page about not being able to get online.
Email is usually pop3, or smtp. The internals of your pc have to be working in order to send email using a client program like outlook, thunderbird, or windows mail.
If you are using webmail (where you send it from within your browser) then that’s a different issue. That one is harder to fix that having a problem with a client mail system.
We work with email a lot, and we are experts at sending email! Give us a call, we’ll sort it all our for you.