Outgoing Email Problems

I had initial problems in December when Cox wanted me to change my Cox password,(Original Email said it was suspicious activity Cox told they were working on a platform) when I did I couldn't get back into my emails. I had to find someone local to remote in and get my Outlook set up again. . It then worked until mid January when they said I needed to up date my setting. I followed their instructions for both PC Outlook and iPhone and it worked until Jan 25 when I became unable to send emails from either pc outlook or iPhone 6s, could still receive, but not send. On the 26th I spent hour and half on phone and made it up to tier 2 where I got a trouble ticket number and spoke to my third different person. She walked me through all of my PC Outlook and phone setting, she did have me change smtp to 587 with encryption connection TLS. Told me to make sure my out box is clear (on iPhone as well) and to wait 8 hours. That was last Friday, I didn't have occasion to have to reply to email until today and it didn't work on either outlook or iPhone. I am trying to find the time and energy to once again call Cox. Seems that this is not just a me problem nor do I think it is a Microsoft problem. I think Cox rolled out changes without much testing and decided that the changes would work for most and that the rest of us would be acceptable collateral damage