Blocking Detected Spam

The device can block and drop detected spam at either the connection level or the e-mail level:

• Blocking spam at the connection level

  When the SMTP sender is identified as a spam sender based on its IP address , the SMTP connection is rejected and dropped. An error message with a proper error code from the firewall is sent out on behalf of the SMTP server. An example of such an error message is:

  554 Transaction failed due to anti spam setting

• Blocking spam at the e-mail level

  When a particular e-mail sender is identified as spam sender based on its sender address, the e-mail is rejected and dropped. An error message with a proper error code from the firewall is sent back to the sender on behalf of the server. An example of such an error message is:

  550 Requested action not taken: mailbox unavailable