Email marketing campaigns are often queued up days/weeks in advance, set up in the system that sends them with lists of recipients attached. Because your unsubscribe removes you from the main customer/lead database but not already set up campaigns, the laws allow some delay from unsubscribe and actually being removed.
It can similarly take time to get added to the regular email sends but you may get a sign-up confirmation and automated series of welcome emails once signing up to list.
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