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UUCP is one of those good things that many early ISP providers overlooked, You had companies with an e-mail server that would dial up to the internet to send and receive e-mail and would get a dynamic IP address. This would be no problem for UUCP, but since many newcomers to the internet didn't know it they would use some clunky dynamic DNS system instead. Also if the connection dropped there was no 'resume' feature if this happened during the sending or receiving of a large e-mail, so it would have to start sending or receiving that e-mail all over again.

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