Did Gmail Promotions tab placement hurt our open rates?

Our weekly product digest suddenly landed in Promotions for most Gmail users after we added more product cards and a Shop Now button. Opens dropped about 18% week over week. Authentication is fine: SPF, DKIM, and DMARC all pass, complaint rate is 0.04%. Is Promotions placement a deliverability problem or just a UI bucket we should design for?

Promotions is not spam. Gmail still accepted and classified the mail. The shift usually follows content signals: heavy images, multiple CTAs, promotional language, and marketing subdomains. Check Google Postmaster Tools for actual spam rate, not just open rate. If spam rate stays under 0.1%, you are healthy even if marketing mail lives in Promotions.

We A/B tested plain-text founder notes above the merchandising block. When the first 200 words read like a personal update, Primary placement recovered for about 30% of recipients in our seed list. Not a guarantee, but it suggests Gmail weighs the top-of-body content heavily. Also worth testing one primary CTA instead of three.

Ran a plainer version: fewer cards, one CTA, more text upfront. Opens recovered roughly half the drop. Still mostly Promotions on Litmus seed Gmail accounts, but engaged users seem to find it. Maybe Primary was never the right goal for a merchandising digest.

Separate your streams. We send transactional and onboarding from one subdomain and marketing from another. Onboarding stays Primary almost always. Marketing accepts Promotions and we optimize for click rate instead of opens. Less anxiety, clearer metrics.