One test email. Two minutes. A clear verdict.
ZwoMailCheck shows you how your domain sends email: whether SPF, DKIM and DMARC are in place, whether your server delivers cleanly – and what exactly you can improve.
- SPFServer may send
- DKIMSignature valid
- DMARCPolicy too lax
- MXReceiving works
How it works
Get an address
You get a test address that accepts exactly one email and expires soon after.
Send an email
Send an ordinary email to it – from the mailbox, shop or newsletter tool you want to check.
Read the result
Within seconds you see a traffic light for each area, what it means and what you should change.
What we check
- Delivery
- Which server delivers your email, whether it encrypts and whether its name and IP address match.
- SPF
- Whether the delivering server is allowed to send for your domain.
- DKIM
- Whether your email carries a valid signature with a strong enough key.
- DMARC
- Whether SPF or DKIM match the visible sender domain and which policy applies.
- MX
- Whether your domain can receive email itself – replies and bounces, for example.
- MTA-STS & DANE
- Whether mail to your domain must arrive encrypted: STARTTLS, MTA-STS, TLS reporting, DNSSEC and DANE.
- Reputation & content
- Blocklists, spam score, your logo in the inbox, required headers, unsubscribe link and the rules Google, Yahoo and Microsoft set for bulk senders.
We delete your test email after 24 hours and the report after 30 days.