outgoing email no longer working

I have changed the settings of my email program to match the new setting required by Cox.  I am able to receive email but not send email.

I am using Thunderbird.  I changed the outgoing server settings to smtp.east.cox.net (no change) /  port 465 (changed) /  ssl selected

What am I suppose to use for Auth. method.  I have tried no auth and normal password but haven't been able to send with either of those selected.

Below that is a place to type in User Name.  It was blank and I left it blank.

Can anyone let me know what I am doing wrong.