I've encouraged the user to contact Centurylink on this. But maybe someone has another idea.
The user uses Centurylink Webmail.
When Composing or Replying, the names can be typed into the form.
But the Body cannot be typed into or Pasted into - at all.
Google Chrome shows a blank body that doesn't respond to a mouse click into it.
Internet Explorer shows "this page can't be opened" and mouse clicks also do nothing.
So, the user cannot send emails at all.
And, I can duplicate this on my own computer - which is entirely separate except for the email account login.