DKIM BASICS

Let DKIM sign every email quietly

DKIM (DomainKeys Identified Mail) adds a tiny cryptographic signature to each message as it leaves your server. Receivers compare that signature with a public key stored in your DNS.

Once configured, the process is automatic. No one reads your traffic—we simply help your systems prove that each message was really written by you and stayed untouched in transit.

  • 1Keys live in DNS; inbox access is never required.
  • 2Signatures are mathematical fingerprints, not readable content.
  • 3Works with any major mail platform—Microsoft 365, Google, Exchange, or custom servers.
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DKIM signature illustration

How it works

DKIM in three friendly steps

Think of DKIM as sealing wax on a letter—except the stamp is math, not melted wax.

1

Publish a public key

We create a selector such as mail._domainkey and publish the public key in DNS. Only you control it.

2

Your server signs automatically

Outgoing emails are signed with the matching private key. It happens inside your mail platform—no forwarding, no external gateway.

3

Receivers verify instantly

Providers like Google and Microsoft fetch the public key, validate the signature, and confirm the message stayed intact.

How DMARCFlow sets up DKIM safely

We coordinate with your IT or provider, generate 2048-bit keys, and make sure every mail stream uses the new selector before we remove older keys.

  • ✔ No need to hand over mailboxes or routing access.
  • ✔ Detailed rollout plan per domain and selector.
  • ✔ Rollback plan ready—delete the record to disable.

Before DMARCFlow

Mail might deliver, but receivers can’t prove the content wasn’t changed en route.

During onboarding

We add selectors, rotate any weak 1024-bit keys, and guide your platform admins through enabling signing.

After go-live

DKIM runs quietly. We monitor signatures via DMARC reports and remind you when a rotation is due.

DKIMFlow dashboard preview

Privacy promises

DKIM proves authenticity without exposing content

A DKIM signature is a hash of selected headers. Even if someone intercepted it, they could not rebuild the email body. DMARCFlow only helps you publish keys and confirm they validate.

We never need IMAP, SMTP, or mailbox access.

Keys stay yours

Private keys remain on your server or provider. We never store them—only the public half in DNS.

No inbox access

All work happens in DNS and your sending platform’s admin console.

Same delivery path

Emails keep traveling directly from your infrastructure to recipients—nothing is routed through DMARCFlow.

Rotation reminders

We document selectors, expiry dates, and alert you before a key needs replacing.

Next step

Ready for effortless DKIM?

Let us generate selectors, guide the platform changes, and verify everything without ever peeking into your inbox.

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