Can't send emails through Outlook 2007 - "sender rejected"
My email has been working fine since May 2022 when I got a new PC. As of four days ago I can't send emails. I tried sending a test message and got "The server responded: 500 5.1.0 <[email protected]> sender rejected. The email address you are sending as must match the email address you used to auth. Please check your SMTP."
I logged into Spectrum email and can send and receive email fine. I haven't changed any settings in Outlook, it just randomly stopped sending emails. I tried uninstalling/reinstalling, with the same results. I've had Time Warner/Spectrum email since the late 90s and never had this happen. Any help would be appreciated!