I noticed that in the

SMTP Server window, down at the bottom there is the label "user name". This box has my email address in it but very faintly. And it will not let me edit the email address in this box.

Actually I solved the problem with one of the email addresses by changing authentication method from no authentication to password.

All of your road runner/twc/Spectum account must have a password.

You also have to have a corresponding outgoing server (SMTP) entry for each account in account settings using the correct email address and password. The matching SMTP entry must also be set in the identity panel of account settings (The one above server settings)

Spectrum used to allow one SMTP to send for multiple email address, they no long do, now you have to use a matching one for the email address. So that will be your problem most likely.

Thank you Matt for the helpful information.

I believe that I have everything correct. Please see the 4 - attached photos?

Best regards,

However the problem is still occurring on one of the 2 - emails.

Thank you,

I have difficulty reading sideways screenshots. When you click to account settings, and then scroll down left side to 'outgoing servers (SMTP) and click, is there a separate SMTP setup for each account? I couldn't tell from the screenshots.

Hello David,

Thank you for the help. My apologies for the rotated photo.

Attached is a photo of the window that you were asking about. I do have a separate SMTP setup for each account. The one that I am having issues with is the default account. Thanks again and I will start sending screen shots instead of photos.

Best regards,

First, there is a little freeware program called snapshot at

  https://bluefive.pairsite.com/free_computer_software.htm  It has the ability to select a specific area of the screen to capture. 

Then, please send screenshot of the full SMTP settings for the account and also a screenshot of the account pane (the one that shows link to SMTP server. Those two should prove helpful.