spam placement
Inbox Placement Test: How to Check Where Your Email Actually Lands
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A 250 OK from the receiving server means your message was accepted. It says nothing about where it was filed. That gap is what an inbox placement test measures, and it is why campaigns with excellent delivery rates sometimes get no replies at all.
What is the difference between delivery rate and placement rate?
| What it measures | Typical number | What it misses | |
|---|---|---|---|
| Delivery rate | The server accepted the message | 97–99% | Everything about where it went |
| Placement rate | Which folder or tab it reached | Highly variable | Nothing — this is the real number |
If your delivery rate is 99% and your replies are near zero, you do not have a delivery problem. You have a placement problem, and no amount of copy rewriting will show up in the delivery metric.
Why are inbox placement numbers usually too high?
Here is the specific technical detail that makes most published placement numbers too good.
When Gmail sorts a message into the Promotions tab, the message carries both INBOX and CATEGORY_PROMOTIONS labels. A placement checker that tests for INBOX first will classify it as a clean inbox hit. But the recipient’s Primary tab never showed that message, so from a reply-rate perspective it may as well have been filtered.
Our own warmup scoring had precisely this bug. The check tested INBOX before the tab categories, so every Promotions landing was recorded as inbox. We corrected it in October 2026 so that the tab categories are checked first, and our reported inbox rates went down. That was the correct outcome: the old numbers were flattering, not accurate.
So when you read any inbox placement figure — ours, a competitor’s, your own dashboard’s — the question to ask is: does this separate Gmail’s Primary tab from Promotions? If it does not, read it as a ceiling.
How can you test inbox placement for free?
You cannot run true seed-based placement testing without real mailboxes at every provider. You can, however, test the things that cause bad placement, which diagnoses the majority of cases:
- Spam-trigger content and structure. Run the spam score checker — it scores your actual message the way a filter would.
- Authentication. Misaligned SPF, a missing DKIM signature or a DMARC policy that does not match will push you toward spam regardless of content. Check SPF, DKIM and DMARC.
- Blacklists. If your domain or sending IP is listed, placement is already lost. Check the major blocklists.
Why one test is not enough
A single placement test describes one moment. Sender reputation moves over days: a volume ramp, a run of bounces, one spam complaint cluster, a DNS change. Placement follows it. For cold outreach in particular, the useful thing is not a test but ongoing per-mailbox monitoring, so a mailbox sliding toward spam is visible before the reply rate tells you.
Related: why emails go to spam, how to stop emails going to spam, and the warmup tool comparison.
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Start free with MailPilotInbox Placement Test — FAQ
What is an inbox placement test?
A test that sends a message to a set of seed mailboxes across different providers, then reports which folder each copy landed in: Primary inbox, spam or junk, or a secondary tab such as Gmail's Promotions. The point is that acceptance and placement are different things — a server can accept your message with a 250 OK and still file it somewhere the recipient never looks.
How is placement different from deliverability?
Deliverability usually means the message was accepted and not bounced. Placement means where it ended up. A 99% delivery rate alongside a 40% spam placement rate is entirely possible, and it is the single most common reason a campaign with 'good deliverability' gets no replies.
Why are inbox placement results often too optimistic?
Because of how Gmail labels tabbed mail. A message Gmail sorts into Promotions still carries the INBOX label alongside CATEGORY_PROMOTIONS. A tool that checks for INBOX first records it as a clean inbox hit, even though the recipient's Primary tab never showed it. Unless a tool explicitly separates the tab categories, its inbox rate is an upper bound.
Can I test inbox placement for free?
Partly. You can check the things that cause bad placement for free — spam-trigger content, SPF/DKIM/DMARC alignment, and blacklist status — which diagnoses most problems. True seed-based placement testing needs real mailboxes at each provider, which is why tools that do it properly charge for it.
How often should I test placement?
Continuously if you send cold outreach, because placement degrades without warning. A one-off test tells you about one moment; reputation shifts over days. Ongoing per-mailbox monitoring catches the drift, which is what actually costs you replies.