This post originally appeared on HubSpot’s Sales Blog. To read more content like this, subscribe to Sales.

We’ve finally found an effective email strategy. Our open and clickthrough rates are optimized — or so we thought.

Until one December morning when our metrics plummet. It must be a mistake.

Or, it’s the holiday season. Each year from November to January, email behavior changes and email strategies lose their effectiveness.

To combat this, we decided to look at 4,513,689 emails to analyze exactly how the holidays impact our one-to-one emails. The presentation below reveals all our never-before-shared insights. 

Let’s explore.

How have the holidays impacted your email activity? Share your experiences in the comments section below.