Opens sliding while your subscriber count climbs? Here are the five real reasons a Beehiiv newsletter misses the inbox — and a 30-second test that shows exactly where your next issue lands.
Most advice stops at 'warm up your list.' Here's the honest version: five signals decide whether your issue reaches Primary, Promotions or spam — and you can check every one of them on the exact email you're about to send.
On Beehiiv's starter plans you send from shared infrastructure and inherit its reputation — good and bad. The day you switch to a custom sending domain, SPF, DKIM and DMARC become YOUR job: one missing record and mailbox providers treat every issue as unproven mail. It's the first thing worth checking, because it fails silently.
Boosts, recommendations and paid growth fill your list with people who never picked you specifically. They open less, delete more, and a few hit 'mark as spam' — and Gmail weighs those complaints per thousand sends. A list growing faster than its engagement is the exact shape providers throttle first.
A sponsor slot, a referral widget, three buttons and a poll — each one is fine, together they read as a promotion, not a letter. That stack rarely means spam on its own, but it's the fastest route to the Promotions tab, and combined with a weak sender reputation it can tip further.
Mailbox providers score senders on rhythm. A newsletter that ships weekly for a month, goes quiet for six weeks, then blasts the full list looks like a cold sender starting over — and gets filtered like one. If you've been away, come back to your most engaged readers first, not the whole list.
Every complaint, every dead address you keep mailing, every spam-trap hit compounds into a per-domain score. It decays slowly and recovers slowly — which is why the fix is never 'send more.' Prune the never-openers, keep the cadence steady, and check each issue before it ships.
Before you rebuild anything: check which tab you're actually in. Promotions is not the spam folder — real readers scroll it, and a good newsletter can live there. But if your issues are in actual spam, no growth tactic matters until that's fixed. The test below tells you which case you're in, on your real email.
You can audit sponsors and widgets all afternoon and still be guessing. Or forward your next issue and see it: we open your real email in real Gmail, Outlook and Yahoo accounts and show the split — Primary, Promotions, Spam — plus the three fixes worth doing first, in plain English. About 30 seconds, free, no signup.
Test your next issueIf you've ever searched "email tester," half the results check whether the address is valid. We do the other thing — whether the email itself will reach the inbox once you press send.
You upload a CSV of subscribers. The tool tells you which addresses bounce. Great for cleaning a stale list before a re-engagement send.
You forward one email — newsletter, launch, client note — to a one-time mailbox. We open it in real Gmail, Outlook, and Yahoo and tell you which tab it landed in, plus what to rewrite before you send it to your list.
Paste the mailbox above into the test-send field in Beehiiv, Kit, Substack, Mailchimp — or your own inbox. Hit go. We never see your subscriber list.
In real Gmail, real Outlook, real Yahoo. We watch where your email lands — Primary, Promotions, or Spam — using the same filters that decide whether your campaign worked.
Plain English. Three things to change, in priority order. Unlock the bundle and we generate a subject, body, and CTA rewrite in your voice — paste them back into your campaign before lunch.
Forward any email and get the score — free and unlimited. Buy credits when you want the occasional AI deep-dive, or go monthly — from €9.99 — if you send regularly. Cancel from the same screen you upgrade on.
Takes less time than picking a hero photo. No card, no signup, no anything.
