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FWIW: i ran into this some years back... i think with altavista but don't remember for sure... if it was altavista, it was right about the time that they switched from being altavista.digital.com to altavista.com... now that i think about it, i'm sure it was AV... FWIW: they are also the *only* SE i've ever submitted my site to... all the others have just dropped by of their own volition :)
WKitty - What I thought might be happening is other webmasters using the same shared/virtual server as myself might be submitting sites. As these would have the same (or similar) IPs that's what was causing the problem.