| 摘要 |
An e-mail filtering system determines whether a received e-mail is an unsolicited e-mail or a possible unsolicited e-mail. If the received e-mail is an unsolicited e-mail, a URL contained in the received e-mail is registered in a memory. If the received e-mail is a possible unsolicited e-mail, a search is made through the memory for a registered URL corresponding to a URL contained in the e-mail. If the corresponding registered URL is detected, the possible unsolicited e-mail is identified as an unsolicited e-mail. In response to receipt of an e-mail, its source IP address or a URL contained in it is used to identify it as a possible unsolicited e-mail and a count value is incremented, which is reset to zero if the time following receipt of a possible unsolicited e-mail has lapsed a predetermined interval. The possible unsolicited e-mail is identified as an unsolicited e-mail when the count value exceeds a threshold.
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