Delivered Is Not Seen. Find Out Which One You Got.

An inbox placement test sends your email to a seed list of real mailboxes at major providers, then checks each one to record where the message landed: primary inbox, Promotions tab, spam folder, or nowhere at all. It measures the actual outcome of a send, per provider, instead of inferring it from open rates after the damage is done. Verifox covers 6 providers and returns the report in under 5 minutes.

A seed list is a set of real, monitored email addresses spread across Gmail, Outlook, Yahoo, Apple Mail, AOL, and Google Workspace. You add those addresses to your send exactly as if they were subscribers. Our system then opens each seed mailbox and logs the folder your email arrived in. Nothing is simulated: the message travels through the same filters your real subscribers’ mail does.

No. Promotions is still the inbox; subscribers see it, and engaged readers open it. Spam is invisible by default and actively damages sender reputation when messages sit unread. Treat Promotions as a tab-optimization problem (fewer images, fewer links, more personal tone) and spam as an emergency. If your mail sits in spam at multiple providers, start with email warmup and authentication, not subject-line tweaks.

A placement test measures the outcome: it checks real mailboxes and reports the folder your email landed in at each provider. A deliverability test audits the inputs: DNS, authentication, blacklist status, server setup. A spam check scores the message content alone. Run the input tests to find what to fix, then the placement test to confirm the fix worked.

Directionally, yes; exactly, no. Seed mailboxes share your real subscribers’ filters but not their engagement history, so an address that opens you weekly will place slightly better than the seed result, and a dead list will place worse. The biggest gap comes from list quality itself: 20 to 40% of B2B lists fail at catch-all domains. Clean the list with email verification before reading too much into either number.

Six: Gmail, Outlook, Yahoo, Apple Mail, AOL, and Google Workspace. Consumer Gmail and Google Workspace are tracked separately because their filtering behaves differently; Workspace admins layer custom rules on top of Google’s defaults. Each provider’s result shows inbox, spam, and missing percentages plus tab placement where the provider has tabs, so you see exactly which audience segment is at risk.

Authentication, then reputation, then content, in that order. Confirm SPF, DKIM, and DMARC all pass with the DMARC, DKIM, and SPF checker; unauthenticated mail loses before content is even read. Next, check whether your domain or IP is listed with the domain spam checker or blacklist check. Only then rework the content warnings from the placement report.

Before every major campaign at minimum, and monthly as a baseline even when nothing changes, because provider filters update quietly and placement drifts without warning. Add an extra test after any change to your template, sending domain, or ESP. Teams on pay-as-you-go credits typically budget a handful of tests per month per sending domain; credits never expire, so an unused month is never wasted.

Yes. Signing up is free, takes no card, and includes 1,000 credits, or 2,500 if you register with a work address. That covers your first placement tests plus enough verification to clean the list you are about to send to. When you outgrow the free credits, volume pricing is shown for your region on the pricing page.

Yes. Every test can be triggered and collected over REST, so you can run a placement check as a pre-send gate in your campaign pipeline and fail the deploy if inbox rate drops below your threshold. Endpoint shapes and auth are in the API docs. AI agents can drive the same engine through the native MCP server with no glue code.