When Gmail broke the rules: What a two-day glitch taught us about user intent

Marketers have long debated the Gmail Promotions tab. Since Google introduced tabbed inboxes back in 2013, the conversation has been the same: “If only our emails landed in Primary, our open rates would skyrocket.”

For two days in January 2026, that hypothesis was accidentally tested, and the results should give every email marketer pause.

What happened on January 24th and 25th?

On January 24th and 25th, a technical issue on Google’s side caused a significant number of promotional emails to bypass their intended destination,  the Promotions tab, and land directly in users’ Primary inboxes. For a brief window, marketers got what they wanted, and the data tells an interesting story.

The numbers don’t lie: Open rates

Looking at open rates across the period, January 23rd–24th showed a modest uptick, with rates nudging toward the 64% range, compared to the typical 53–58% seen on surrounding days. On the surface, that looks like a win. But context is everything.

[Figure 1: Daily opened rate, 17–31 January 2026. A modest uptick is visible around the 23rd–24th of January, coinciding with the Gmail Primary tab incident. Overall average open rate for the period: 56.91%.]

The real story: Unsubscribe rates

If we look at what happened to unsubscribe rates over the same window, the average for the month hovered around 0.29%. On January 25th, there was a sharp spike to approximately 0.4%, more than 50% above the baseline.

[Figure 2: Daily unsubscribed rate, 17–31 January 2026. A significant spike to ~0.45% is clearly visible on 25th January, over 50% above the monthly baseline of 0.29%, directly following the Gmail tab disruption.]

Subscribers weren’t engaging. They were opting out.

A small, ambiguous bump in opens and a very clear, unambiguous spike in unsubscribes. That is the true result of forcing promotional email into a space users hadn’t consented to.

Forced engagement is not real engagement

The root problem with the “get into Primary at all costs” mentality is that it treats the inbox as a battlefield to be conquered rather than a space governed by user intent. Gmail’s tab system isn’t a wall keeping your emails from subscribers; it’s a contract with your audience. Users who check the Promotions tab are actively choosing to engage with commercial content on their own terms. That intent is extraordinarily valuable.

When you disrupt that contract, deliberately or, in this case, accidentally, users don’t become more receptive to your message. They become more defensive.

What marketers get wrong about the promotions tab

The Promotions tab has a perception problem. Because it sounds like a lesser destination, many marketers assume it means lower engagement. But intent-driven engagement is always more valuable than incidental engagement.

When a subscriber opens your email in the Promotions tab, it is because they’re ready to browse offers. That is infinitely more valuable than someone who opens it in Primary because it interrupts their workflow. The former is a warm lead, the latter is a person with their finger hovering over “Unsubscribe.”

The January glitch gave us a rare, real-world, unplanned A/B test of this exact dynamic,  and the results were unambiguous.

The lesson for your email programme

Rather than fighting Gmail’s categorisation, the smarter strategy is to work within it—respect where your audience expects to find you. If your emails consistently land in Promotions, your engaged subscribers know exactly where to look for you, and that’s a behaviour you’ve earned. Focus on quality over placement, because a compelling subject line, relevant content, and a well-timed send will drive opens wherever your email lands. Watch your unsubscribe rate closely, as it is one of the most honest signals your audience can give you. 

Trust and intent are everything

Your subscribers trusted you enough to share their inbox with you. That trust is fragile, and the data from January 24th and 25th shows just how quickly it can erode when that trust is disrupted, even accidentally. When a subscriber navigates to the Promotions tab and opens your emails, it is an important sign of intent to engage with your brand.

The Gmail Promotions tab isn’t your enemy. The instinct to circumvent your audience’s preferences is.