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Email Domain Health Check

MX, SPF, DKIM and DMARC for a domain in one report, with a plain-English list of what to fix.

Deliverability starts with DNS. Mailbox providers check SPF, DKIM and DMARC on every message, and since 2024 Gmail and Yahoo require all three from bulk senders. This report checks each one and lists problems by severity.

What do Gmail and Yahoo require from senders?

For bulk senders: SPF and DKIM on the sending domain, a DMARC record (p=none is enough), alignment between the From domain and SPF or DKIM, one-click unsubscribe and a spam rate under 0.3%.

Clean a whole list

Upload a CSV and get every address checked: syntax, domain, mailbox, catch-all and disposable.

Start with 100 free credits
  • Finds the email column in any CSV, keeps your other columns
  • Deliverable, risky, undeliverable or unknown, with the reason for each
  • Download everything, or only the addresses that are safe to send to
  • An API for sign-up forms and CRMs
  • Lists are deleted after 30 days