Email deliverability checker: SPF, DKIM, DMARC and MX in one click.
Type a domain. See what Gmail and Outlook will see.
Reads public DNS through Google Public DNS. Nothing is stored.
MX
Where your domain receives mail. Missing MX looks like a throwaway domain.
SPF
Which servers may send as you. One record, under ten DNS lookups.
DKIM
A signature proving the message wasn't changed. Set up with your mail provider.
DMARC
What receivers do when SPF or DKIM fail — and where to send reports.
More: the 18-point checklist · DMARC for cold email · Google & Yahoo sender rules
Questions, answered
What does this checker test?
Public DNS for your domain: MX records, SPF (TXT v=spf1), DMARC (_dmarc TXT) and DKIM at common selectors. It reads public records only — nothing is sent and nothing is stored.
Why can't it find my DKIM record?
DKIM lives at a selector your provider chooses. We try 21 common ones, including Google, Microsoft, Hostinger, Brevo and Zoho. If yours is different, enter it.
What is a good DMARC policy for cold email?
Start at p=none with reporting, fix every legitimate sender until it aligns, then move to quarantine and reject.
Is this the same as Quotarider's mailbox health check?
It's the public part of it. Inside Quotarider, the read-only health check also looks at each connected mailbox's bounces, complaints and ramp, and shows the steps for your provider.
Records fine? Now protect every send.
Quotarider scores each email before it leaves — and can pause a sequence before your domain suffers.