| 摘要 |
A method for blocking and/or filtering electronic mail. Selected senders are provided with a valid passcode associated with an e-mail address. When an e-mail is received at a mail server node, a field in a header of the e-mail is checked for a valid passcode associated with the destination e-mail address. If a valid passcode is detected, the e-mail is automatically sent to a receiver at the e-mail address. If an incorrect passcode is detected, the e-mail is automatically deleted at the server node and does not reach the receiver. If there is no passcode in the e-mail header, the e-mail is held temporarily, until the receiver approves to receive the e-mail. If the receiver rejects the e-mail, the e-mail is deleted. The present invention includes an additional capability for the senders of e-mails to request a passcode associated with a specific e-mail address in a lookup directory, before sending an e-mail to that address. Furthermore, the present invention enables firewall servers to block incoming e-mails only if they are received from the public Internet, thereby allowing all internal e-mails to reach the receiver without having to include valid passcodes.
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