Mac Mail not sending my yahoo emails

Since yesterday, my Mac Mail will not send emails out for my Yahoo smtp email address. This has been set up for almost two years and I did not change anything. I am still receiving my email fine! I'm not getting the normal relay error message I sometimes get with other email accounts. It just sits in outgoing for hours!
Can anyone help me?

Try opening up a terminal window and telnet to the smtp server's port 25. If that doesn't work, there is probably some firewall issue or you might have mistypyed the name of the smtp server.
The telnet command would look something like ...
telnet smtp_server 25
If you get a response from the SMTP server, check with your ISP's tech support to verify that you are connecting properly.

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