Years ago, I set up two additional email addrs through att/yahoo as att is the "provider". I'm using T-bird. While I've been able to receive email from these addresses, I'm not able to SEND email from them. rATT tells me it's a yahoo problem and vice-versa. I'm the 'customer' and stuck. When I attempt to SEND from either addr I get: "An error occurred while sending mail. The mail server responded: From address not verified - see http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html. Please verify that your email address is correct in your account settings and try again." The above link takes me to: https://help.yahoo.com/kb/mail-for-desktop. I checked the outgoing server settings in T-bird and found smtp.att.yahoo.com. So just who admins this: att or yahoo? I'm not sure how to link the other two addrs which end with [email protected] to this. Odd I can receive email, yet att/yahoo didn't bother to tell me I can't send it without additional steps. Under account settings > Manage identities...> one of the [email protected] addrs is listed as an 'identity'. When I chose 'edit', it tells me the outgoing server is the same as that above. I thought this was sufficient...evidently NOT! Just what's going on here and how do I remedy it? TIA...... PS: I logged on to yahoo to view my main email account in their web page. Then looked for any way to attach/link this secondary @yahoo.com addr to the main/default one. No joy.... One link took me to att.com to set up a new account or set up additional aliases using att.com, but that's not what I want.