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Did a whois lookup on both sites, and both
www.ep.com and
www.epvip.com have the same information, FWIW.
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The risk is that some emails contain URLs that use non-standard characters that look like real characters. So
www.epvip.com and
www.epvip.com might look like they go to the same place, but in fact don't. However, I believe firefox now detects this and mangles bad domain names when you enter them into the browser so its obvious you aren't on the right site.