Hi @EllenM8700. Great question. When you are sending an email to a tag, it will be sent to all contacts who are tagged as such. In this case, if you sent an email to the Veteran tag, all contacts with the tag would receive the email, including those with the Donor or Prospect tag.
You'll want to create segments for those with the tags of "Veteran AND Donor" and "Veteran AND Prospect" and send separate emails to each segment, assuming the emails contain different content.
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