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How Do You Know If An E-mail Address No Longer …

Comment on Valid Mailing Address – It Means Good Service by Dreamwalker.

How Do You Know If An E-mail Address No Longer Works? Usually, if you send an e-mail to a non-working address it will come back as undeliverable, yes? Is that always the case? Could there be a case of it being a nonworking address and you would not get notification?

Thanks

 
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