Unable to verify account name or password when setting up email.

I was unable to send email (but could receive) in my mail account on my Macbook pro. It was suggested that I delete the account and reinstall it. Unfortunately, I didn't save my password. When I try to setting up my account again, I get the error message (in red), "Unable to verify account name or password".

I called my internet provider and they had me change my password. I did. Still doesn't work. I use this email on my phone, and had to change my password on there as well. That is working. Any suggestions on how I can retrieve my password, or bypass that and reinstall with a new password. Been working on this for 3 days. TY in advance.