Configure a bulk operation to apply a tag to your subscribers that have received a particular broadcast.

If you are unfamiliar with bulk operations, please check out this article!

Create a new bulk operation:

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Select the Choose a segment of existing subscribers option:

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Apply the filter that will return only the subscribers that have received a particular broadcast:

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There are other options within the above filter besides the has received parameter:

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Apply the tag:

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Click the Next button to schedule when the bulk op should be performed.