IMSS blocks hosts that appear in the Blocked List.

Procedure

  1. Go to Sender Filtering → Blocked List.
    The Blocked List screen appears.
  2. Click Add.
    The Add Blocked List Record screen appears.
  3. Select the Enable check box.
  4. Specify the domain, IP address, or subnet address and mask for the host that you would like to add to the Blocked List.
  5. Select Block temporarily or Block permanently.
  6. Optional: If you select Block temporarily, specify the block duration.
  7. Click Save.
    The host appears in the Blocked List.