Mail Keeps Redownloading Old Emails Whenever I switch Wireless Networks

Hey Everyone,
I am experiencing some technical difficulties with Apple Mail.
I have configured Mail to download all emails from my online Yahoo account using the configuration settings from Yahoo.
When I am using my wireless network at home, the client downloads all my NEW mail as expected.
However, whenever I connect to a different network, say at the office or at university, or even in a foreign country, Mail downloads ALL the emails in my Yahoo mailbox again.
Instead of simply downloading NEW mail messages like it is supposed to, whenever I connect to a different network, ALL my emails (both old and new) are redownloaded from the server.
Once I return back home again to my usual wireless network, it will once again download ALL the mail, both old and new, again. Until I switch to another network, it will work fine.
This is a terrible inconvenience, as I store thousands of emails online, and thus have to wait for about 45 minutes for mail to finish downloading all of the emails before I can check my new mail.
Any assistance with this matter is most appreciated.
I am using OS X 10.4.7 and Mail 2.1 (752/752.2) on an iBook G4.

You're welcome.
Any other means through which I can solve this?
None that I know of in your case. Actually, some ISP's are clueless enough to tell users that the cause of the problem is that mail isn't being removed from the server. And some users are clueless enough to be happy "realizing" what the problem was and how easy it is to "solve" it -- see duplicated emails, for example.

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Mail Keeps Redownloading Old Emails Whenever I switch Wireless Networks

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