MAIL cannot send anything!

Everytime I try to send a message through the Mail program, I get the following error:
This message could not be delivered and will remain in your Outbox until it can be delivered.
The connection to the server "smtp.mac.com" on port 25 timed out.
Now, before this happened, my first two attempts were successful. Also, when I go through Mac.com and Safari, the Mail service works fine. The problem only occurs in the Mail program.

Sorry. I didn't tell you exactly the precise way to navigate the settings panel so you could find port 25.
Mail>Preferences>Accounts>AccountInformation>ServerSettings.
Look for Server port there. Should be 25.
Make that whatever port I suggested yesterday.
(Was that SSL box ticked, or not? be sure you leave that the way it was. Whichever way it was.
Who's your ISP? Comcast?Adelphia? They typically block port 25 unless you use their SMTP server.
Changing to 587 is easier.

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    +Cannot send message using the server (NAME).+
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