I get the following error messages:
An error occurred while sending mail. The mail server responded: Transaction failed : Cannot send message due to possible abuse; please visit http://postmaster.ya...abuse_smtp.html for more information. Please check the message and try again.
When I click on OK, I then get the following:
Sending of message failed.
The message could not be sent because the connection to SMTP server outgoing.yahoo.verizon.net was lost in the middle of the transaction. Try again or contact your network administrator
I then tried sending a very short email (the message was simply "Test") to my second email address, and it sent successfully. I then tried copying the longer message from a received email into a new Write email and sending it, and again the sent failed with the same two error messages above.