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My cousin has a Laptop that is running Windows XP and Outlook 2007. When she's using other internet connections aside from her home wifi everything works fine. I logged in and checked out her router and there's no ports or any special settings that I could that might cause an issue. I'm not entirely sure what I should be looking for aside from blocked ports. Has anyone had this issue? Could there be a setting in Outlook that could be a fix?

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What do you mean by "Can't access"? Are you getting an error message? Having trouble sending? Receiving? Please update with specific details as to the trouble you're having. – music2myear Feb 23 '12 at 21:59
    
If it is only happening on the home network, then it may be DNS related. – iglvzx Feb 23 '12 at 22:11
    
We need to know if the problem is with sending, receiving or both. If the problem is sending (most probable) then it will undoubtedly be that her ISP is blocking the SMTP port required to send emails - many ISPs do this to ensure their customers can't be used as open relays (for spamming). If her ISP blocks SMTP for servers it doesn't own then there's nothing she can do with Outlook or her router. She should be able to access a webmail of some sort (such as OWA for an Exchange server). – Big Chris May 29 at 19:48

If your cousin's laptop has outlook configured to use at her work or school, it might have been configured to user that location's outlook exchange server on that local domain or at an IP address that is not externally available. Verify that the outlook send/receive settings are to external addresses. If that is ok, verify the router assumption by trying to connect to outlok at another location (an internet cafe).

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OP quotes When she's using other internet connections aside from her home wifi everything works fine. so i would assume its working at other places along with work network – pun Oct 11 '15 at 0:45

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