Graymail isn’t spam — it’s mail your subscribers once asked for but no longer engage with. Mailbox providers track that low engagement and start routing your campaigns to the Promotions tab or straight to junk. Preventing graymail is mostly a matter of sending content people still want to open.
What is graymail? Solicited bulk mail (newsletters, promos, alerts) that recipients ignore. It hurts deliverability without ever being marked as spam.
Practical steps to prevent it
The five habits that move the needle the most:
- Segment by interest and behavior. Relevant content gets opened and clicked, which signals engagement to ISPs.
- Re-engage or sunset inactive contacts. Removing dormant addresses lifts your overall open rate.
- Set a clear cadence. Subscribers know what to expect and unsubscribes drop.
- Personalize subject lines and preview text. Higher open rates push you out of the Promotions tab.
- Make unsubscribing easy. One unsubscribe is far better than a spam complaint.
Engagement signals that matter
Opens, clicks, replies and time-spent reading all tell mailbox providers that your messages are wanted. Read more about email engagement and how list segmentation protects sender reputation.
Watch out If your open rate drops below ~10% on a segment, treat that segment as graymail risk and pause or re-engage before sending again.
Learn the difference between graymail and spam
See our quick reference on graymail vs spam, the full blog explainer, and the definition of graymail.