Charter.net email – cannot send email

Upon retirement, my university email has closed. I have been trying to change to email offered by my ISP - Charter.

I have a MacBook Pro and use Microsoft Office for Mac 2011 that uses Outlook (not Entourage).

I cannot fully operate my @charter.net email. I can receive email messages but I cannot send emails.

The error message: "A message in your Outbox could not be sent. The account which created the message cannot be found. # 17199"

I have followed all permutations of instructions on the Charter website and their support staff will only support the web based email site.

Question about Outlook Express