I set up a 2nd verizon account and get the following error message when
trying to send email from it. Any ideas how to get it straightened out?

The message could not be sent because the server rejected the sender's
e-mail address. The sender's e-mail address was 'sample@verizon.net'.
Subject 'Email Test', Account: 'sample@verizon.net', Server:
'outgoing.verizon.net', Protocol: SMTP, Server Response: '550 5.7.1
Authentication is required to send mail as <xts738xg@verizon.net>', Port:
25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78

(Note that I changed the email addresses in the above, but the error message
is otherwise unchanged.)

Thanks in advance.

Fred