Email deliverability test (inbox test)
Other tools inspect your DNS records and make an educated guess. This one measures reality: send a message to the address below from your own system and we'll read the mail itself — your sending IP, your SPF result and your DKIM signature.
1. Send a message to this address from the system you want to test:
test+b77a7ae3d878be6298@felixmail.email2. Waiting for your message
Waiting for mail… (keep this page open)Send a real message: from your mail client, your application or your marketing tool. The content doesn't matter — the sending system does. Mail usually arrives within seconds.
The address is yours alone and expires after 30 minutes. Your message is deleted immediately after analysis; nothing is stored.
Why is this test different from the others?
SPF, DKIM and DMARC checkers inspect your DNS records and tell you they look correct. But correct records don't mean the mail you actually send passes authentication.
The most common example: your SPF record is flawless, but your mail leaves from a server that isn't listed in it. The checker gives you an A and your mail still lands in spam. This test closes that gap — it takes the real IP of a real message and evaluates SPF against it.
We can do this because we run our own mail server. Your message reaches us, we read its headers, and we delete it as soon as the analysis is done.
What do we measure?
The sending IP and its reverse DNS (PTR) record; your domain's SPF record evaluated against that IP for a real pass/fail; whether the mail is DKIM signed, whether the signature aligns with your sending domain, and the length of the public key in DNS; your domain's DMARC policy; and whether the mail reached us over an encrypted connection.
These five explain the overwhelming majority of deliverability problems. Content scoring (spam words, image-to-text ratio) is deliberately absent: when authentication is right, content is rarely decisive, and content scoring is a contested area that varies wildly between tools.
Privacy
Your unique address is valid for 30 minutes. Your message is read only to analyse its headers and is deleted from the test mailbox as soon as that's done. The content is never stored and never shown in the results.
For that reason we suggest sending an empty or sample message rather than a real customer email — what we measure is your sending system, not your content.
Frequently asked questions
How do I test email deliverability?
Send a message to the unique address on this page from the system you want to test. When it arrives, your sending IP, SPF result, DKIM signature, DMARC policy and TLS usage are analysed and scored automatically.
Which address should I send from?
Whichever system you care about: your own mail server, your Google Workspace account, your application's sending service or your marketing tool. The test measures the sending system, so you can send from several and compare.
My message hasn't arrived — what should I do?
It usually takes a few seconds. If it takes more than a minute, your sending system may have a delivery problem — if you received a bounce, our bounce decoder can explain it.
Is my message stored?
No. It's read only to analyse the headers and deleted from the test mailbox immediately afterwards. The content is never stored anywhere.
Is this tool free? Do I need an account?
It's completely free and requires no account.