Can no longer send e-mails in Outlook 2003?

Hi, pls help......
I can now only receive e-mails in Outlook 2003, but cannot send. Error message reports that my Port 25 is blocked (error message: 0x8004109).
Checked the same account on an XP machine using the same POP3 and SMTP servers and router and no problem - can send & receive OK.
Did the same on another VISTA machine and e-mail works OK.
Added a different account to the non-operational VISPA PC and it reports the same error. Problem is definately isolated to my VISTA PC. (32-bit / Packard BELL).
The problem started about a month ago, and prior to that, all systems worked perfectly.
Unisntalled AVG10 completely.
Disabled Firewall. Uninstalled all Windows updates for last 2-months. Created inbound & outbound rule to open PORT 25 (using mmc.exe). No change e-mail still does not sned!

Port 25 does not show using the "netstat -an" command.

ISP reports all systems working correctly on their side.

Computer connected to a hub - router via ethernet cable!

Any suggestions before I take a hammer to the PC?:sa:

Hello and welcome to the forum.

Try the following to see if it will help get you back up and running.

http://www.vistax64.com/tutorials/62560-windows-mail-problems.html

Top 11 Free Email Programs for Windows - About Email

Hope this helps if not please post back to this thread and we will see what else can be done...

Right off the bat I'd recommend you switch to Mozilla Thunderbird, it's a ton easier to use. I switched to it after it took me 30 minutes to figure out how to add access to multiple accounts in Outlook. But that's just me.

As for your problem, you've done everything I'd have done to test it, so just stick with americancritic and I'm sure he can get it figured out.