Hi Crystal,
Can you tell us more about whom you want to block? For blocking competing domain or personal domain addresses, you can do this either by:
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javascript (there is some code here: test.hollebone.ca or just do a search on the community)
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Smart List filter on the email trigger.
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Holding Queue
For the Smart List Trigger, just create a Smart List "Competitors" and then drag that below the Fills Out Form trigger. That should block a bunch of people.
For the Holding Queue, you can let anyone sign up, but all of those leads end up in a SFDC Queue or just in a smart list/member of program. Then you can remove some of those people using a Competitor smart list or by hand. Then you can run a batch email to send out the link.