Can no longer send mail - strange errors/activity

I'm hoping a guru can help me. This is driving me insane. My mail has worked perfectly for years. Over the past 2 days, it can no longer send mail. I can recieve, but not send.
It first began with error messages saying that it couldn't use Port 25. My ISP doesn't block this port, so I tried using four other mail servers from other email accounts. Again, all give the same error. Now when I try to send a message, they just sit in my out box. When I try to resend, it does nothing. The activity monitor quickly states "Copying message to outbox". That's it.
I'm at a loss. Any help is really appreciated.

Ignore this message, I JUST WORKED IT OUT.
It looks like there is another unsecure wireless network in our building and for some reason my Powerbook defaulted to using that, rather than my own wireless account.
So with this other connection I could surf/recieve but I couldn't send out.
The variables never cease to amaze me.

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