Just noticed this happening> I have 3 emails addresses being utilized on my 1 Thunderbird setup. When I try and send from any address but the original one I set up I get this message: Sending of the message failed. An error occurred while sending mail. The mail server responded: <davet102@roadrunner.com> sender rejected. The email address you are sending as must match the email address you used to auth. Please check your SMTP settings. AUP#Out-1500. Please verify that your email address is correct in your account settings and try again. I understand what it is saying. I just do not know where to fix it. I have gone into the outgoing SMTP settings and my original email address is in there. How do I set it up so that the other email addresses can send from their email addresses? Bob