Thunderbird 2 email addresses using the same SMTP server

This is a recent problem, which I did not have until the past month.
I have 2 different email from the same spectrum account, one for personal and one for business. They both use the same SMTP server.
But when I send from one account, I get an error that the email has to be sent from the same email address I logged in with. I check the SMTP server for that email address and it is changed to the other one. I was able to keep each SMTP server, giving them SMTP server a different name and associate each email with the same server this way. Now Thunderbird sees them as being the same and I can’t send the email without changing the SMTP server email address all the time. I am using the most recent version of Thunderbird.