A Halloween email is a seasonal send that ties a brand’s offer or content to the late-October holiday, usually rolling out across the weeks before the 31st through costumes, candy, decor, party prep, or playful spooky themes. The strongest ones commit to a clear hook (a sale, a gift guide, a countdown) rather than leaning on novelty alone. Use atmospheric color and motion sparingly, keep the CTA obvious, and never bury the deadline.