Sending Mail, Port 587 not working

My Mail app doesn't send anything. I can receive stuff with not problem, and I did a search here on the forums and found that changing the port to 587 was one fix. That did not work.
The message I am getting it that the server is timing out, and after calling my ISP and being on the phone with them for half an hour they said if was an apple issue.
Has anyone figured out any other fixes besides changing the port to 587?
Blake

Blake,
This may only be a typo as you posted, but you have misspelled the server name, in that I am sure the prefix should be smtp and not stmp.
If only a typo as your posted, then this might be an issue with MTU (maximum transmission unit). See the following support document for methods of diagnosing this:
http://docs.info.apple.com/article.html?artnum=303192
If lowering the MTU manually works, then we can look for other ways to fully accomplish the correct balance, which might include shutting down modem, router, and other elements of the network and then repowering.
Ernie

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