| 摘要 |
A message transfer agent generates specific error codes indicating that it has adjudicated specific received email traffic to comprise spam. The message transfer agent transmits the generated specific error codes to the sources of the specific received email traffic. An antispam computing device filters email traffic, and receives the error codes transmitted by the message transfer agent to the sources of email traffic. The antispam computing device interprets the specific received error codes as indicating that the message transfer agent adjudicated the specific email traffic to comprise spam. In response, the antispam computing device can block email traffic from these sources, such that the blocked email traffic does not reach the message transfer agent. |
