| http://www.w3.org/ns/prov#value | - If they respond, add them to the whitelist and deliver queued mail Mail not handled by either list or verified queues up for a certain amount of time, during which the mail user can go and flag specific addresses as whitelisted (allowing them to pass through things when they do things like sign up for mailing lists or accounts or other things which generate automatic email) After a certain number
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