SPF BASICS

SPF is just your allowlist

SPF (Sender Policy Framework) is a single DNS record that lists which servers are allowed to send mail for your domain. When receivers see something outside that list, they treat it as suspicious.

It does not forward your mail or expose it. DMARCFlow simply keeps the list tidy so the good senders stay in and everything else gets flagged.

  • 1Lives as one TXT record in DNS.
  • 2Only lists systems—no message data involved.
  • 3Works quietly with your existing mail provider.
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SPF record illustration

How it works

SPF in plain language

Receivers compare the server that delivered your email with the list in your SPF record. That’s it.

1

List trusted senders

We document every platform that sends mail (Microsoft 365, CRM tools, invoice systems) and add them to the SPF record.

2

Receivers cross-check

When Gmail or Outlook receives a message, it checks if the connecting IP appears in your SPF list.

3

DMARC reacts

DMARC uses the SPF result to decide whether a suspicious message should be monitored, quarantined, or rejected.

How DMARCFlow maintains SPF

We map out every service, keep the DNS entry under the 10-lookup limit, and monitor changes so nothing breaks.

  • ✔ No access to mailboxes or CRM data required.
  • ✔ Clear documentation for auditors and IT.
  • ✔ Rapid rollback by restoring the previous TXT value.

Before DMARCFlow

SPF might be outdated or missing senders, so spoofed mail slips through.

During onboarding

We stage a cleaned-up record in monitor mode, add missing services, and remove dead includes.

After go-live

You receive change logs and alerts whenever a new tool needs to be added. Email delivery keeps working as before.

SPF monitoring illustration

Privacy promises

SPF never exposes message content

The SPF record is just a list of permitted hosts. DMARCFlow edits that list—it never sees who you email or what you send.

All information stays at the DNS layer.

DNS only

We work with TXT values, not inboxes.

No rerouting

Mail continues to travel directly from your provider to the recipient.

Full reversibility

Rolling back takes one DNS edit. There is no software lock-in.

Visible audit trail

We document every include, mechanism, and timestamp.

Next step

Need a tidy SPF record?

Let DMARCFlow map, clean, and monitor it so you never worry about delivery or privacy.

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