Can't send mail after trying New Port

I've read the discussions regarding sending mail via smtp. Tried under mail serves smtp.mac.com, smtp.me.com, smtp.me.com:primagirl. Tried to change to port 587 from 25. with SSL and without checked. Nothing can be sent! Please help!

Hi, here are the settings for outgoing mail through MobileMe:
Server: smtp.me.com
Port: 25
SSL: On
Authentication: Password
Username: MobileMe account name without the @me.com
Password: Your MobileMe password.

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Can't send mail or type new message

I'm using OS X 10.4.7 and after installing the most recent update, I can no longer send mail in the mail program. When I hit reply, nothing at all happens. I get a new message window when I hit forward, but I can only type two letters, then nothing happens, and I can't send.
I am receiving mail fine and I can send through comcast.net. Other computers on my network can send mail, but not mine.
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FIESELAD
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This particular problem in Mail is usually caused by some Launch Services cache or preferences corruption. The following article describes how to manually reset Launch Services. The notes at the bottom of the article also provide information about the side effects of deleting each of the files involved.
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The following article also describes the side effects of cache cleaning:
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The following article provides links to some utilities that can be used for troubleshooting and cache cleaning:
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It seems that the most appropriate utility for solving this particular problem is Tiger Cache Cleaner.
In addition to the utilities mentioned above, you may also consider OnyX, which is free. If you want to try OnyX, after installing it, do this (be sure to read the articles about the side effects of cache cleaning first):
1. Quit all applications.
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I didn't even update. One day Mail just stopped sending mail. Can't remember doing anything specific. Looks like a common problem these days from having read several discussion boards. I'm on the bandwagon. Reinstalled, created new accounts, triple checked, checked with ISP, disabled password authentication...
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luckymommy wrote:
smtp.xxxxx@@smtp.comcast.net
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Can't send mail after trying New Port

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