cannot send e-mails in Yahoo


New Email
When I press send, I get a list of numbers-letters to be typed. When I do this I get an error message:
Your message was not sent
Suspicious activity has been detected on your account. To protect your account and our users, your message has not been sent.
If this error continues, please contact Yahoo! Customer Care for further help.
We apologize for the inconvenience.
What can I do to fix this.


New Email
can't send email. getting message that my account has suspicious activity, etc. given coed to enter but messages not sent.