For the past two days, I have not been able to send mail from one of my Verizon.net sub-accounts using Mozilla Thunderbird. However I can send mail from the Verizon Yahoo webmail website.
I get this error message:
An error occurred while sending mail. Transaction failed: Cannot send mail due to possible abuse; please visit http://postmaster.yahoo.com/abuse_smtp.html for more information.
And when I click on "OK" in the message box, this second error message pops up:
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.
When I go to http://postmaster.yahoo.com/abuse_smtp.html, there is just a generic Yahoo help page, with nothing specific about this problem.
The possible abuse is likely a 24 hour hold for accounts suspected of sending Spam. Are you still having issues? Also what ports do you have the incoming/outgoing server set to?