Can't send e-mail w/new POP settings...

Hi, all,
I updated my POP & SMTP settings as demanded by Verizon and I now can't send e-mail from one of my subaccounts. I get the error message:
An error occurred while sending mail. The mail server responded:  5.7.1 Authentication is required to send mail as <r******[email protected]>.  Please verify that your email address is correct in your Mail preferences and try again.
I don't use that e-mail address, which I guess is the "technical" address I got when I signed up. The address I'm trying to use is s******[email protected], and that's the e-mail address that is set up in the account on my e-mail program (Thunderbird). I never use the address the error message is referencing.
Any suggestions on how I can fix this most annoying problem?
Thanks!

Without seeing your settings, it's going to be somewhat difficult to guess the problem. I would take another look at your SMTP (outgoing) settings, and verify that the server is set to authenticate with the correct username and password.
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