Turns out that the problem appears that the Login name now needs to include @verizon.net. I found a post on the internet from 2009 that mentioned something like that but ever since Verizon transitioned email to AOL, our Login's configured in outlook and Mail used just our email addresses names without the @verizon.net and has worked perfectly fine for better than 3 years. Something must have changed overnight at AOL that no longer recognized the Login name without @verizon.net on their outgoing mail server. Even Verizon's Faq at
https://www.verizon.com/cs/groups/public/documents/adacct/setup-email-mobile-device.pdf
indicates the Login should be without the @verizon.net (page 6). I added the @verizon.net to the Login name on all accounts on all platforms and everything is now working fine. So much for the $14.99 monthly cost of customer service from AOL.
Original problem first surfaced for us on 4/7/2020 affecting POP3 accounts set up using different @verizon.net email accounts on separate PC and iPad devices using Outlook and Mail clients. No problem with incoming just outgoing. Suspected an issue with smtp.verion.net so tried contacting AOL but after 3 hours on hold and only a few minutes speaking to anyone live and having had to subscribe to the $14.99/mo support servcie, the only thing anyone could say was that something with our mail client must have changed. Well that was total **bleep** give that multiple platforms and clients and email accounts were affected. After searching for answers on the internet while waiting on hold, I came across a 2009 post long before the AOL migration that talked about needing the @verizon.net in the Login so I gave that a try and it worked and when I applied the same fix to the other accounts, devices and clients, our problems were resolved.
