How do you fix Gmail-specific spam placement?

Your emails are landing in Gmail spam and you're not sure why. Authentication looks fine, you're not on any blocklists, and yet there they are, buried. The frustrating truth is that Gmail filters more on engagement than almost anything else. It's not just about whether your emails are technically clean. It's about whether Gmail's users actually want them.

Here's how to work through it, in the right order.

Start with Postmaster Tools

If you haven't set up Google Postmaster Tools, do that first. It gives you domain reputation, IP reputation, spam rate, and delivery error data specific to Gmail. That's information you can't get anywhere else. Your domain reputation is the single most important signal in there. If it shows "Low" or "Bad," that's your problem in one word. Spam rate above 0.3% is a warning sign. Above 0.8% and you're in trouble.

Check your authentication records too. Gmail wants SPF, DKIM, and DMARC all passing and aligned. A DKIM signature on a subdomain that doesn't match your From domain is a subtle misalignment that will quietly hurt you.

Segment before you do anything else

Stop sending to people who haven't opened in 90 days. That sounds harsh, but every send to a dead address either gets ignored (hurts engagement ratios) or hits a recycled spam trap (very bad). Either way, Gmail notices.

Pull your Gmail subscribers into three buckets: opened in the last 30 days, opened in the last 31 to 90 days, and nothing beyond 90 days. For now, pause the third group entirely. Send only to the first two until your reputation recovers.

Run a proper re-engagement campaign

For the 31 to 90 day group, run a short win-back sequence before you suppress them. Something like this works well in practice.

• Email 1: Simple, plain-text message. Something like "We noticed you haven't been around. Still interested?" with a clear yes or no option.
• Email 2 (3 days later): One clear value reminder. What's the best thing they've missed? One link, not five.
• Email 3 (5 days later): The goodbye email. "We'll stop sending unless you'd like to stay." Include a one-click resubscribe.

Suppress anyone who doesn't engage. Don't feel bad about it. A smaller, engaged list sends better signals to Gmail than a large, disengaged one. (Of course, that's easier said than done when your list size feels tied to your worth as a marketer.)

Ask for positive signals from engaged subscribers

Gmail pays close attention to what engaged users do with your emails. Replies are gold. Moving emails out of spam manually, adding your address to contacts, clicking through to your site. All of these tell Gmail's filters that real people want your mail.

Now you can ask your most engaged readers to do these things directly. Something like "If you love getting these, add us to your contacts so Gmail doesn't swallow them" works fine in a welcome email or a regular send. Don't over-engineer it.

Check your content and sending patterns

So if you fixed engagement and authentication and you're still seeing spam placement, look at your sending behavior. Sudden volume spikes, new IPs without warmup, or domain age under six months can all trigger Gmail's filters. So can content signals like too many images with no text, too many links, or subject lines that pattern-match to known spam.

You can separate content issues from reputation issues by testing a stripped-down plain-text version of the same email to your most engaged Gmail subscribers. If it lands in the inbox, the issue is content. If it still hits spam, it's reputation.

Gmail's filters are engagement-driven at their core. Clean authentication and good list hygiene get you in the room. Consistent, wanted emails keep you there. If you want a second pair of eyes on what Postmaster is telling you, our SOS hotline is free and we'll walk through it with you.