If you have searched for "inbox placement test" in the last five years, you have seen GlockApps. Their Inbox Insight product is the category default — three free tests per month, then $59/mo for the Starter tier. It is a fine product. It is also, for most users, unnecessary. This article walks through exactly what a placement test produces, what GlockApps charges for, and where to get the same report free.
A placement test sends a seed message to controlled mailboxes at Gmail, Outlook, Yahoo and others, then reports where it landed — Inbox, Promotions, Spam or missing. GlockApps does this across ~15 providers for $59/mo. The same test, on 20+ providers (including CIS and EU mailboxes GlockApps does not cover), is available free and without signup at this site.
What a placement test actually is
Your ESP's dashboard will tell you messages were "delivered". That only means the receiving mail server accepted the SMTP handshake — it says nothing about where the message ended up. The message could be in the inbox, Promotions, Spam, Junk, Quarantine, or filtered before the inbox view entirely. A placement test closes that gap.
The mechanic is simple. The tool exposes a list of seed addresses at real providers. You BCC or send a real campaign to that list, wait 30–120 seconds, and the tool logs in to each mailbox and records which folder received the message. That folder map is the placement report.
What you get in a placement report
A complete placement report normally includes:
- Folder placement per provider — Inbox / Promotions / Spam / Missing at Gmail, Outlook, Yahoo, etc.
- Authentication verdict — SPF pass/fail, DKIM pass/fail, DMARC pass/fail with alignment.
- Spam-engine scores — SpamAssassin and (sometimes) Rspamd rule breakdown.
- DNSBL status — whether the sending IP or domain is on a known blacklist.
- Raw headers — the full received-headers chain for debugging.
- Screenshots (some tools only) — visual proof of what the recipient actually sees.
GlockApps pricing and what is gated
GlockApps Inbox Insight as of 2026 has the following tiers. The free tier gives you 3 spam tests per month. The $59/mo Starter unlocks ~300 tests, seed coverage at ~15 providers, SpamAssassin scoring and DNSBL checks. Higher tiers add uptime monitoring, API access and bulk seed lists.
To be fair to GlockApps, the product has genuine strengths: a mature API, multi-seat team accounts, uptime and IP-monitor integrations, and historical data retention beyond 90 days. If you are a deliverability-as-a-service agency handling a dozen client domains, those features are worth paying for.
For a single sender, or for a lean SaaS team running a monthly newsletter, they are not. You are paying $59/mo for the three things a tool like this one gives away: folder placement, auth verdict and spam-engine scores.
Why free tools used to be terrible (and what changed)
Five years ago the free placement tools were awful. Two or three seed mailboxes, no CIS coverage, no screenshots, and the only "report" was a pass/fail on a single Gmail address. GlockApps had a moat because running 15 real seed mailboxes across 15 providers, at scale, was expensive.
Two things changed. First, open-source Rspamd reached production quality and now runs alongside SpamAssassin in most mail-server stacks — which means the same scoring engines paid tools rely on are freely available. Second, provider APIs and IMAP automation matured to the point where running 20+ seed mailboxes is an engineering problem, not a commercial one.
The 20+ provider coverage matrix here
Coverage is the first place paid and free tools diverge. GlockApps covers roughly 15 providers, heavily weighted toward US/Western webmail. CIS providers (Mail.ru, Yandex, Rambler) are absent or unreliable. Some EU providers (GMX, Orange, Laposte) are partial.
Free coverage at this site:
- US / global: Gmail (Primary + Promotions), Outlook.com, Hotmail, Yahoo, AOL, iCloud, ProtonMail, Fastmail, Zoho.
- EU: GMX, Web.de, T-Online, Orange, Laposte, Free.fr, Wp.pl, Onet.pl.
- CIS: Mail.ru, Yandex, Rambler.
If you send to Russian-speaking customers, EU B2B, or any market outside North America, this is the single biggest difference — and it is the one you cannot work around with a $59 credit card.
Screenshot evidence
A placement verdict is a row of labels: Inbox / Promotions / Spam. That is useful. A screenshot of the actual inbox view is more useful. It shows the subject line as rendered, the sender display name, whether Gmail fired the "This message looks suspicious" warning, and where inside the Promotions tab the message sits.
GlockApps does not ship inbox screenshots. Inbox Check does, on every provider that allows automated IMAP or API access. It is a small thing that turns a single-row report into something you can hand to a manager.
SpamAssassin and Rspamd verdicts
GlockApps reports a SpamAssassin score and rule breakdown inside the paid tier. Rspamd — the modern successor used by Mailcow, iRedMail, Postfix-based stacks and many enterprise gateways — is not covered.
Inbox Check runs both engines on every test, free. The Rspamd output matters because any recipient on a modern self-hosted or enterprise mail server is being scored by Rspamd, not SpamAssassin. Testing only SpamAssassin in 2026 is like testing only IE11.
GlockApps vs Inbox Check
- Inbox placement test — GlockApps: $59/mo (3 free/mo) — Inbox Check: Free, 3/day
- Providers — GlockApps: ~15 (no CIS, no EU) — Inbox Check: 20+ (Gmail, Outlook, Yahoo, Mail.ru, Yandex, Rambler, GMX, Orange, ProtonMail…)
- Inbox screenshots — GlockApps: No — Inbox Check: Yes
- SPF/DKIM/DMARC — GlockApps: In paid report — Inbox Check: Every test, free
- SpamAssassin + Rspamd — GlockApps: SpamAssassin (paid) — Inbox Check: Both (free)
- DNSBL check — GlockApps: Paid — Inbox Check: Free
- MCP for AI agents — GlockApps: No — Inbox Check: Yes
- Signup — GlockApps: Required — Inbox Check: Not required
When GlockApps is still worth paying for
Being fair: there are real cases where a paid tool is the right answer. You should probably pay for GlockApps if you need any of the following:
- Uptime and bounce monitoring integrated with the seed list — GlockApps ships this in the Pro tier, Inbox Check does not.
- Historical data beyond 90 days — required for long-term reputation trending and agency reporting.
- Multi-seat agency accounts with per-client dashboards and billing separation.
- Dedicated support with a named account manager, for teams whose deliverability directly drives revenue.
- Paid-API integrations with specific ESPs (Salesforce Marketing Cloud, Eloqua) that have partnership agreements.
If none of those apply, the free test gives you the same actionable output: where did the message land, why, and what to fix.
No placement tool — paid or free — is a perfect predictor. Your real-world recipients do not all behave like seed mailboxes. Gmail in particular weighs per-user engagement signals that a seed account cannot replicate. Treat any placement report as a directional signal, not a guarantee.