I use my talk talk e-mail through windows live mail (windows 10). In last 3 days it still receives Ok, but wont send. Messages I try to send or reply to disappear, but don't go in "Sent" or "Drafts" folder.

I get "an unknown error has occurred. Windows Live Mail error 0x8007007A. Protocol SMTP. Port 587"

Can send messages ok if I log on to "my talk talk". Its only through Windows live mail it wont work.

Can anyone advise please because talk talk cant.