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Is it safer to send credit card number via unsecured website form or by e-mail? What safer options are there?
Some (most) credit cards have a way to get a one-time use number. If that is an available option for one of your cards, that is probably the way to do the very risky transaction. These numbers can be good for only one purchase, or for multiple purchases with a single vendor. This will limit your exposure because they won't have access to your entire account. Also review your fraud protections with your credit card. With the single use number, it won't matter if you use the electronic form or the email. Just make sure you keep the confirmation email or a screen capture of the form.