All e-mail messages contain in their headers information about their origin. By examining the message headers, you can determine which IP address or addresses you want to filter.
In the raw e-mail message headers, look for the IP address that you want to filter. The IP address is often in the Received: header.
After you know which IP address or addresses you want to filter, you are ready to set up filtering in cPanel. To do this, follow these steps:
Locate the account for which you want to add a filter, and then click Manage Filters.
Alternatively, you can filter a range of IP addresses. For example, the following regular expression matches the last 256 addresses in the network:
For more information about IP addressing, please visit https://en.wikipedia.org/wiki/IP_address.
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