Please also post a screenshot of the SMTP server pane. The error message indicates that the two settings are not the same. This error usually happens when a person has more than one email account and one of the accounts is using the wrong SMTP server. Thank you.

To David. Thanks for your reply. I only have one account that I know of. I also receive send and receive emails on my my laptop. but normally only use the laptop when I'm traveling. I'm assuming they're the same account because I use the same email address and the emails I receive on my PC and laptop are the same emails. (received emails on my laptop disappear when I open up Thunderbird on my PC) I'm having no problem sending emails from my laptop, (no error message)

I'm not sure what the "SMTP server pane" you mentioned is, but I pressed the "Outgoing SMTP" listing on the side of my account settings and I've attached the screen that came up.

I should also say that I copied the SMTP server that is listed on my laptop account settings into my PC's SMTP server space but I still got the error message when I tried to send an email Thank you so very much for your time in responding to this..

Have you checked with your provider (spectrum) if that server even exists any longer?

Their user settings page shows for the following email address domains; Brighthouse.com, bak.rr.com, bham.rr.com, cfl.rr.com, emore.rr.com, eufala.rr.com, indy.rr.com, mi.rr.com, panhandle.rr.com, tampabay.rr.com

• Incoming Email Server: mail.brighthouse.com
• Outgoing Email Server: mail.brighthouse.com

For TWC.com and any domain ending in .rr.com not covered above

• Incoming Email Server: mail.twc.com
• Outgoing Email Server: mail.twc.com

I really think you need to update your server settings. Probably for incoming as well, but certainly for outgoing.

Assuming the server is correct, the user id needs to include the @ and all characters to the right of it. I also suggest changing to port 587 and setting authentication to STARTTLS. Your account pane must also use the full email address.

Thank you to both David and Matt. I think it took both of you to solve the problem. To David, I changed the id and port as you suggested and set authentication to STARTTLS. To Matt, as you suggested, I changed the outgoing server to mail.twc.com but added the RoadRunner/TWC to the server name (RoadRunner/TWC - mail.twc.com) and to the description to match what I had on my laptop. (which was working ok). What made it confusing was that I had just been sending emails with no problem. This problem started out of the blue. I want to thank you again for helping me and responding so quickly. You two prove there still are white knights in shining armor out there. XXOO

Aw, shucks, ma'am. We were glad to assist. :)