The Lead Blocklist feature allows for the specification of criterion to be blocked from the Lead system. The options are:
Sender IP Address
Sender IP CIDR Range
Sender Email Address
Access the tool as shown here:
Create a new rule with the "New" button.
Select the Block Type and fill in the fields as required. The rule is the specification to be matched for the type of block. Save the Blocklist when complete. The block can be designated here as Published (active) or Unpublished (inactive). These can be changed once the block has been saved.
After a Blocklist has been created, there will be options to Publish, Unpublish, Delete or Edit.