Greetings,
To add to this discussion, the Adelphia/Road Runner email system is too old and has not been updated in YEARS. Spectrum has done some slight email modifications. But many of us strongly recommend the use of a free webmail client. Webmail will be yours forever, is updated regularly, and is more consistent with security and modern technology. Gmail, Yahoo Mail, and Outlook.com are all free and are all excellent!
The BEST Webmail Ad Blocker out there for all three of these free webmail providers, comes from web extensions developer and programmer Jason Savard who writes great extensions for the main browsers. (Google Chrome, Firefox, and Microsoft Edge.) You can read his reviews online as well. Mozilla Firefox even recommends his email ad blocker:
https://addons.mozilla.org/en-US/firefox/addon/webmail-ad-blocker/
Go to Jason's site in the browser of your choice to get Jason's email ad blocker (below: )
https://jasonsavard.com/
Get his web mail blocker, I have not used his other extensions, but this guy has strong credentials as he works on extensions 24x7. One note is that Jason's email ad blocker only works for Gmail, Yahoo Mail, and Outlook.com mail only! It does not block other types of banner ad content on the web, so if you still use Ad Block or Ad Block Plus, keep using that for other content.
The thing is that Ad Block Plus only blocks some email ads but not others, and Yahoo Mail has found a way to force people to turn off Ad Block Plus where you either have to accept Yahoo's crappy ads, or go to Yahoo Premium mail, for a monthly fee, or be reduced to a very basic free email.
Jason's email ad-blocker hides ALL banner ads in the above popular email programs, in fact, if I am at Gmail, Yahoo Mail, or Outlook.com. I just turn off Ad Block Plus to avoid any conflict with Jason's extention. (But remember, do this only at the big three email sites above.)
Satch