So what is your problem with Outlook then?
Your posts suggests you haven't finished configuring your Linux mail server
yet.

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
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>I am running vista ultimate and office 2007, so i have a problem setting up
> my e-mails. I have a linux mail server, i created the e-mail address but
> now
> after setting up outlook with pop3 as my Incoming and smtp as my outgoing
> using same IP address ( Linux server IP address for the two i still cannot
> recieve internal/extenal e-mails but i am able to send only internally.