1 866 235 4333 Yahoo Mail Unable to Send Message ?
if you are Unable to Resolve your issues then here are successfully tips here
Start with a new message. Click the Compose button to create a new message.
Enter your own Yahoo Mail address in the To: field.
Type the name of the mailing list in the Bcc: field. If the email doesn't already have a Bcc field, click CC/BCC at the top right of the new email to add it.
Compose and send the message.