Cannot send message from Outlook

HI all.
 
One of my user having WindowsX home Edition  Laptop. When connected the
network, that particular user is not able to send & receive mail from the
outlook, His outlook is configured as POP3 mail. When he dialup from
outside/overseas, he can able to send & receive mail. When he comes in LAN
environment user cannot send & receive mail.
 
Any idea to solve this issue...
 
 
Thanks
VIjey

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