Delivered isn't the same
as in the inbox.
A clean list gets you to the door. Placement decides whether you walk through it. Seed-test across Gmail, Outlook, Yahoo and Apple Mail to see Inbox, Promotions or Spam per provider — with full SPF, DKIM and DMARC checks and the exact record to fix.
One number that's honest.
Every seed test rolls up into a single grade — measured from real deliveries, not modeled. Below it, the breakdown that earns it: per-provider placement, auth, and the one fix that moves it most.
- Inbox — Primary tab, full reach
- Promotions — landed, but tabbed away
- Spam — invisible, reputation at risk
See exactly where you land.
Send your real campaign to our monitored seed inboxes and we read the placement back per provider — Inbox, Promotions, or Spam. No guessing, no modeling. The actual result.
- Per-provider breakdown. Gmail, Outlook, Yahoo and Apple Mail — including the Promotions tab.
- The ‘why’, not just the score. We name the spam triggers and the broken record dragging you down.
- Measured, never modeled. Real deliveries to real seeds — we show our work.
SPF, DKIM & DMARC, decoded.
The records that decide your fate are invisible until they fail. We check all three plus alignment and reverse-DNS, then tell you in plain English what to change — and hand you the exact record.
- Pass / warn / fail at a glance. No DNS expertise required.
- Copy-paste fixes. We give you the literal record, not a lecture.
- Alignment & rDNS too. The subtle misconfigs most tools miss.
Guidance you can act on.
Placement is a symptom; reputation is the cause. We connect the two — so you fix the root problem, not just today's bad send.
Reputation, scored — not guessed
Authentication, complaint and bounce signals fold into one sender-health read, with the single thing to fix first surfaced at the top. No 40-metric dashboard to decode — the verdict, then the lever.
List quality is reputation
Spam-traps and dead addresses are what torch your sender score. Verify and clean first — placement follows.
Warm-up & cadence advice
Sending too much too fast on a cold domain? We flag it and recommend a ramp providers actually trust.
From blind send to certain.
1 · Send to seeds
Add our seed list to your campaign and hit send like any other broadcast.
2 · Read placement
We detect Inbox, Promotions or Spam for every provider in seconds.
3 · Check auth
SPF, DKIM, DMARC, alignment and rDNS — graded, with fixes.
4 · Fix & resend with confidence
Apply the plain-English fixes, re-test, and watch your inbox rate climb. Pair it with verification and automated cleaning to keep it there — credits never expire.
Placement, programmatically.
Read inbox rates and auth status straight from the API and gate your sends on real placement data. One request, structured JSON back.
# Inbox-placement API — private beta (request access).
# Run placement tests in the dashboard today; API access on request.
curl https://platform.emaillistchecker.io/api/v1/inbox-placement \
-H "Authorization: Bearer $ELC_API_KEY" \
-d test_id=june-promo
{
"overall_inbox_rate": 0.84,
"providers": {
"gmail": { "inbox": 0.91, "spam": 0.02 },
"outlook": { "inbox": 0.72, "promotions": 0.26 },
"yahoo": { "inbox": 0.88, "spam": 0.04 },
"apple_mail": { "inbox": 0.96, "spam": 0.00 }
},
"auth": { "spf": "pass", "dkim": "pass", "dmarc": "p=none" },
"advice": "Tighten DMARC to quarantine; remove 3 spam-trigger phrases."
}They send on certainty now.
We thought we had a 99% inbox rate. The seed test showed Outlook was tabbing two-thirds of our sends to Promotions. Fixed the DMARC, recovered the reach in a week.
The auth check is the clearest I've used. It didn't just say 'DMARC fail' — it handed me the exact record to paste. Saved our deliverability engineer a full afternoon.
Knowing inbox vs spam per provider before a big launch changed how we send. We no longer fly blind on send day.
Good to know.
Know where you land — before you send.
Run a seed test, check your auth records, and fix what's tabbing you to spam. Start free — no credit card.