What do you want to validate? That they are real email addresses, or just that they're in a valid email format? You can't validate them as real email addresses unless you have something else to check them against and validating their format is limited to checking that they have a @ character with some text before & after, but no invalid characters. In other words, the ability to validate anything about email addresses is very limited.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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