You can't password protect an email message. You could password-protect a
Word document and email it to the recipient, though.
> I want to send an email that is password protected. I will provide
> the recipiant with the password by phone. How can I do this?
You can acquire a personal certificate from Thawte or VeriSign, give your
public key to your recipient, and then send a message encrypted with your
private key which the recipient will be able to decrypt with the public key.
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Brian Tillman