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when registering at websites, my correct email address is declared "not a valid email"

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Often when I try to register at websites, my correct email is declared "not a valid email". Sometimes when I enter it over and over, it is accepted but not always. I have tried several email addresses and no luck solving the problem.

Often when I try to register at websites, my correct email is declared "not a valid email". Sometimes when I enter it over and over, it is accepted but not always. I have tried several email addresses and no luck solving the problem.

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There are websites that do not accept email addresses from domains like Hotmail or Yahoo!, but require an email address from your ISP. So if you use one of those then you may need another email address for such sites.

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So my ISP provider would be the cable or phone company that provides my internet service?

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Yes - Internet Service Provider