Free ToolsIn Development

Email Deliverability & SPF/DKIM Checker

A real, live DNS-based checker for SPF, DKIM, DMARC, and blacklist status is in active development. Here's what it will test, and why each check matters.

Coming soon: we're building a real, live domain checker for this page rather than shipping a fake one. Until it launches, connect an inbox inside your Outtricks workspace to run a genuine SPF/DKIM/DMARC/blacklist check against your own sending domain.
SPF (Sender Policy Framework)

A TXT record at your domain that lists which mail servers are allowed to send on your behalf. Without it, receiving servers can't confirm your email is coming from an authorized source.

DKIM (DomainKeys Identified Mail)

A cryptographic signature added to outgoing mail, verified against a public key published at a selector-specific DNS record. It proves the message wasn't altered in transit.

DMARC (Domain-based Message Authentication)

A policy record telling receiving servers what to do when a message fails SPF or DKIM — monitor, quarantine, or reject — and where to send reports.

Blacklist / RBL status

Whether your sending domain appears on public reputation blocklists (e.g. Spamhaus, SURBL), which mailbox providers consult before accepting your mail.

Automate deliverability monitoring across 50+ inboxes

Connect an inbox in Outtricks to run real SPF/DKIM/DMARC/blacklist checks and get a send-volume ramp + rotation built in.

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Email Deliverability & SPF/DKIM/DMARC Guide | Outtricks