Email Deliverability Test Inbox Placement Test
Send an email to our seed mailbox using the subject we give you and see in real time whether it lands in the Inbox or Spam — with a deliverability score and the receiver's SPF/DKIM/DMARC verdict.
See whether your emails land in the Inbox or in Spam.
- 1Hit “Start” — we give you a seed mailbox and a unique subject.
- 2Send an email from your system to that mailbox using the EXACT subject.
- 3As soon as it arrives, you see the folder (Inbox/Spam) and the score automatically.
Zoho Mail
subs.gr
Gmail
Outlook
What is the Email Deliverability Test?
Deliverability tells you whether the emails you send reach the recipient's Inbox or end up in the Spam folder — or aren't delivered at all. Two emails can both be “sent successfully” by your server, yet only one lands in the Inbox. This tool measures exactly that: inbox placement.
How does the seed test work?
We give you one or more seed mailboxes that we control, together with a
unique subject for each run. You send an email from the system/server you want to test to
those mailboxes, using the exact subject. We connect over IMAP, detect which folder the message
landed in (Inbox or Spam) and compute a score. We also read the message headers and show the
SPF/DKIM/DMARC verdict as the recipient saw it.
Inbox, Spam or “not arrived”?
- Inbox — the email passed the filters and was delivered normally. ✓
- Spam — delivered, but filed under junk. Usually caused by weak SPF/DKIM/DMARC, poor IP/domain reputation or “spammy” content.
- Not arrived — not detected yet. Check that you sent to the right mailbox with the exact subject.
Heads up: at the large providers inbox placement is personalised per engagement (how much each recipient opens/replies to your mail). A result from fresh seed mailboxes is indicative — it shows whether you pass the basic filters, not an absolute guarantee for every recipient.
Overall grade (A–F) & Sender Health
Once the test completes, besides inbox placement you also get an overall A–F grade. It starts from the placement score and deducts points for sending-infrastructure issues, detected from the headers of the real email you sent:
- Blacklists — your real sending IP is checked against 19 DNSBLs (−10 per listing, capped at −30).
- Reverse DNS (FCrDNS) — the IP must have a PTR that forward-confirms (−10 if missing/unconfirmed).
- SPF record — must exist on the sender domain;
+allcounts as dangerous (−10). - DMARC — missing entirely: −10; present but
p=none: −5. - MX records — sender domain with no MX (can't receive replies/bounces): −5.
Anything that could not be verified (e.g. no IP detected in the headers) deducts nothing.
How do I use it?
- Hit “Start test” — the destination mailbox and a unique subject appear.
- Send an email from your system to that mailbox, using the exact subject (copy-paste it).
- Keep the page open — as soon as it arrives you see the folder, the score, the A–F grade and the sender health automatically.
Frequently Asked Questions
SPF, DKIM and DMARC (see the SPF/DKIM/DMARC tool). Then check whether your IP or domain is on a blacklist. This test shows you the authentication verdict as the recipient saw it.+all, DMARC missing or p=none, and a sender domain with no MX. A ≥ 90, B ≥ 75, C ≥ 60, D ≥ 45, E ≥ 30, otherwise F.