Email not working

My email just suddenly stopped working yesterday afternoon. 

1-Tried different browsers, no go.

2-Tried clearing cookies and cache-Nope.

3-I enter the correct info it goes to error 404 Page Not Found, if the password or username is wrong I get an immediate message stating that the username or password is wrong.

4-Tried adding the email to Gmail and it says: server denied POP3 access for the given username and password

5-Technical support changed the password on their end and say they can log in

6-Tried changing the setting per the page link they sent, no go

7-Tried the sign in link they sent, same error page

8-It stopped working simultaneously on: 2 separate desktop computers, a mac, android phone and an iPad

9-Changed ports and server to imap per technician and page link set, nope

10-Tried deleting and redoing the emails on all 3 devices, nope

11-I can log into the account with the emails associated with the account but when I click the email link I get the error 404 page not found.

12-In the address bar of the 404 webpage not found it says deactivated: https://www.cox.com/residential/support/email/ deactivated-mailbox.html (had to add a space to keep it from turning into a link)

13-Anytime I type myemail.cox.net into an address bar I get the error 404 webpage not found.  Adding https:// in the front does the same thing.  Both browsers, both fo which had cookies and cache cleared (firefox and edge).

14-For Firefox I did go into the settings and manage data under cookies and site data and removed all.  Still a nope.

15-Just tried on google chrome, nope, goes to error 404 page not found.