| 摘要 |
An e-mail system includes an address book (108) that registers all e-mail correspondents wishing to send messages (202) to a particular user recipient. All e-mail directed to the user from outside is blocked unless the sender is registered in the address book and has a valid token (200). A limited number of such tokens are issued to each correspondent, and only after the sender has satisfactorily disclosed their identity. Such tokens limit the amount of access to a recipient. If the recipient later decides that any such sender is, in fact, a spammer, then any further e-mail from that sender can be blocked.
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