The newsletter still shows from "ddaniel@mydomain" instead of "theodore@myotherdomain". Note: the sent from email, "ddaniel" isn't my main host email that I use for logging into my cpanel, so I have no clue where the plugin is pulling that email from other than the plugin itself. I have the ddaniel email set as my Test Email.
I just tried to configure through gmail, with the same results. Even though it was connected and confirmed through my google account, when I sent a test email, it still said "from ddaniel".
When I click on "Newsletter" in my WP navigation panel, it takes me to the Newsletter Dashboard. At the bottom of this dashboard is the email address in question, "ddaniel@mydomain.com". It has a green button next to it that says "Stay Updated". No matter what I do, I cannot change that email. This is the only place that I can see in my whole site where this email still remains