Mail can't send messages

I have AT&T Yahoo DSL and my imac mail can't send messages. It says the smpt server has timed out trying to send the message on port 25.

Open Connection Doctor in the Window menu
Double click on whatever is showing as red.
Check the following settings.
pop.att.yahoo.com
smtp.att.yahoo.com
Click Advanced to enter the SSL and port info.
Both incoming and outgoing mail use authentication
Use (SSL) and SMTP port 465.
Use (SSL) and change the POP3 port 995.
Confirm the above settings before clicking OK.
Then check connection doctor again.
There is an incoming mail server and an outgoing mail server for each account.
So for each account there should be 2 servers.
Count how many servers there are set up in connection doctor.

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