I have 3 accounts set up on Thunderbird. Two are sbcglobal accounts and one is a gmail account. Several Months ago I had a problem with my first sbcglobal account on TB. It kept asking for my password. I found out that I needed a Secure Mail Key password, and when I got that the account worked and is still working fine. Last week the 2nd sbcglobal account kept asking me for my secure mail key and I was able to get that for this account, and I can now receive mail, but when I try to send mail from that account, it doesn't send and I get the following message. "An error occurred while sending mail. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again" I'm not sure how to fix this. Please help!