How to Check Email Inbox Placement

What a placement test actually measures

A placement test uses seed addresses that belong to the testing service, spread across Gmail, Outlook, Yahoo and other providers. Your message is sent to those seeds exactly as it would be sent to a prospect, and the service records which folder received it. If a seed never receives the message, that is usually a filter decision rather than a delivery failure.

The result is a snapshot of how one message from one sender looked to a set of mailboxes. It is useful because it is independent of your own inbox and your own provider's view. It is limited because the seeds are not your real recipients and their engagement history is not the same.

Read the whole result, not one number

A placement report can show inbox, spam, promotions, quarantine and missing. A message that lands in promotions is not the same as one in spam: promotions is a category, while spam is a judgement. A message that goes missing from one provider but lands in the inbox elsewhere points at a provider-specific signal such as authentication alignment or domain reputation.

Look at the pattern across providers. If every provider filters the message, the problem is probably the sender or the list. If only one does, compare authentication, link domains and content between the versions you tested.

When to run it

• Before the first send from a new domain.
• After adding or changing inboxes.
• After changing the tracking domain or adding a new link host.
• When a campaign's reply rate drops without a change in the offer.
• After a list change that adds a new source or segment.
• Following a blocklist removal.

Running a test after every small copy edit is usually wasted effort. Run it when something structural changes, and keep the results alongside the campaign record so you can compare.

Fix the cause the test points to

If placement is poor everywhere, work through authentication, warm-up and list quality first. If the message lands in promotions at Gmail, reduce images, remove multiple links and make the email look like a person's note rather than a newsletter. If one provider filters it, check whether your domain has a history with that provider and whether your DMARC policy is aligned.

If a link is the problem, move tracking to a branded domain and make sure the destination page matches the promise in the email. Link shorteners and redirect chains are common triggers.

Placement and Mail Pro

Growth and Business plans include inbox placement tests and sender health checks, so the test sits beside the campaign that produced it. Starter includes warm-up and verification but not the placement panel; if placement testing is central to your process, Growth is the plan that includes it.

Use the deliverability checklist to fix the basics before testing, and how to avoid the spam folder for the copy and link rules that show up most often in placement reports.

A worked example

A team changes its tracking domain from a shared provider hostname to a branded subdomain. Before the change, placement shows a share of messages in spam at two providers. After the change, they re-test the same message and the same list: the spam share drops, but one provider still filters it. The remaining issue is a missing DMARC record on the new subdomain, found by comparing headers. The test did not fix anything, but it narrowed the search.

That is the correct use of placement data: as a diagnostic that shortens the list of suspects, not as a score to chase.

What placement cannot tell you

It cannot predict a single recipient's decision, and it cannot guarantee that a campaign will reach every inbox. It also cannot replace reply and complaint data, which reflect how real people react. Treat placement as one input among three: authentication, placement and engagement.