Cannot send email (Outlook w/iPad and iPhone)

I recently changed my password (I used a desktop computer to do this) for my two cox.net email addresses. As soon as I did that, I can still receive emails, but no longer can send emails on my iPad or iPhone (I can on my MacPro laptop/Outlook, though). My server settings on my two devices (for over two years now with these two devices) have always been: Incoming: imap.cox.net and Outgoing: smtp.cox.net 587/SSL enabled. I have updated the passwords in "settings" on my laptop and both devices; I have deleted my email accounts on my devices only and re-added them; I have tried changing the outgoing server ports to 465; I have created new outgoing smtp servers, and ensuring everything I do is exactly the same on both my laptop and devices...absolutely nothing has worked. For example: One of my two email addresses is kbrisson@cox.net. If I attempt to send an email from this account, the error message I keep getting is "kbrisson@smtp.cox.net is incorrect." (same for my other email account.) I have never seen this error message before. I've had my two Cox addresses for about 10 years. I've had these two devices set up to send/receive email with the same settings for over two years with zero issues, until I simply changed my password. Currently on my devices, the Incoming mail server is: Host Name: imap.cox.net, my User name (only user name, not cox.net), and current password. (Primary) Outgoing Mail server is: Host name: smtp.cox.net, My user name (only user name, from my primary account) and current password. SSL is enabled, password authentication is on, and server port is 587.