For yahoo mail try changing the SMTP port to 465, and select 'This server requires a secure connection (SSL)'.
Hope this helps.
The line is already checked that says "Use default Ports (25,465,587) and the Secure Connection is already checked.
If you have an option to select port 465 specifically please go ahead and do that, then try to send email again.
Let me know.
Thanks for the accept.
Ok, but I thought you said the error message was "plus.smtp.mail.yahoo.com doesn't support TLS (SSL) on port 25" . That is why I asked you to change to port 465.
Can you please try sending another email (say to your own address) and let me know what the exact error message says.
Ok, this means that either the mail server is temporarily down or there is another setting problem. Before you make any other changes I suggest that you try again in a couple of hours and see if it will work.