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How can I block e-mails from unknown sender?

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I received an e-mail from an unknown sender, purporting to be a bank I don't use. What do I need to do to stop receiving this type of e-mail?

I received an e-mail from an unknown sender, purporting to be a bank I don't use. What do I need to do to stop receiving this type of e-mail?

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Depending on what email provider you use, there is tons of different ways.