FluentSMTP default email address
I learned the hard way (a few hours with my isp and Claude) that the first email address in your SMTP list of emails is the default. I think there should be a checkbox to indicate which one is the default sending address.
I generally put noreply@domain.com as the first and then something else (hello@domain.com) after it. You should get the option to select which one you need to use, but I get it. Sometimes I smack enter and just go without hitting all the things.