Email - can't SEND outgoing messages. Can receive them, just can't send (since last night).

Suddenly, since last night (Dec. 31st), am unable to send emails. Everything was working perfectly before.

Receiving incoming messages is fine.  Just cannot send.   

I use Outlook for email.    The sent messages are just sitting in my "Outbox" just waiting to send.  Error message says Ox80042109, Outlook cannot connect to your outgoing (SMTP) e-mail server, contact your ISP.

Any suggestions anyone?  

Cox moderator?

This happened about a month ago and lasted 2 days.  I did nothing............and then all of a sudden everything worked fine again.

This sounds like an issue between Microsoft and Cox, and the Outlook program???