HELP! My Office Mail Cannot Send Out Externally!

Hi all, recently I've upgrading/migrating to my new G5 in the office (whopee, finally!) I have transferred all my old data to Mail, settings everything etc, I can send and check email, I can log on to my office intranet and can actually surf the web, the only thing I cannot do is send email EXTERNALLY!!
Help! I have checked and even toggle some settings, e.g. in Mail account, under SMTP, use Authetication/Password etc but still no avail...
Anyone with such similar experience?? Thanks and cheers

Hi, just some updates, I have tried several methods, including the most drastic one by removing out all the Mail folders, data, plist preference files etc, and start Mail anew, creating my office email account from the ground up, and still, I cannot send out email externally - so "proving" my "old" mail data is ok, so I copied them back.
Could it be the SMTP that is causing all these problems?? Our office POP and SMTP settings are in "IP style" numbers addresses, e.g. xx.xxx.x.x
I am trying to get my IT dept to give me a new SMTP, if possible...
Here's another thing I found out when I launch Mail Connection Doctor:
It reported status Green, and Details-Connection and login to server succeeded.
But... Internet Connection Status, RED - Mail was unable to connect to the internet, click the "Assist me..." button for help diagnosing the problem.
When I continue with the diagnostic, it says "Your internet connection appears to be working correctly."
So I guess the office network/intranet has no problem connecting to the internet... but is this affecting Mail's ability to send out email externally??
Cheers

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HELP! My Office Mail Cannot Send Out Externally!

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