can’t send attachments

Hi there

I have two email addresses on my windows live account.  One ends @live.co.uk, the other is my old @hotmail.com address

The trouble I am having is that neither account will allow me to send messages with attachments.  I have tried photos, pdfs, and word docs from both accounts but all the email does is sit in the outbox.

Normal emails without attachments send fine and I receive attachments fine too.

Not computer savvy at all so very detailed explanation on what to try would be really appreciated.  I can't even find email settings?

Thank you....