If your business has never set up SPF, DKIM, or DMARC, someone can currently send email that appears to come from your own domain — to your customers, your vendors, or your own staff — without ever touching your systems. These three settings exist specifically to close that gap, and none of them require ongoing maintenance once configured.
What each one actually does
- SPF (Sender Policy Framework) is a list you publish saying which mail servers are allowed to send email on behalf of your domain. Receiving mail servers check incoming email against this list — mail from an unlisted server can be flagged or rejected.
- DKIM (DomainKeys Identified Mail) attaches a digital signature to outgoing email, proving it genuinely came from your domain and wasn't altered in transit. Receiving servers verify the signature against a key you've published.
- DMARC (Domain-based Message Authentication) ties the other two together — it tells receiving mail servers what to do when a message fails SPF or DKIM checks (quarantine it, reject it, or just report it), and can send you reports showing who's been sending email claiming to be from your domain.
Why this matters beyond your own inbox: without these in place, scammers can send convincing phishing email that appears to come from your company to your customers or partners — damaging trust in your brand even though your systems were never actually breached.
Setting it up
The takeaway
These three settings are a one-time setup that most email providers now make close to plug-and-play, and they close a gap that's otherwise invisible until it's actively being exploited against your customers. If your business has never checked whether these are configured, it's worth fifteen minutes to find out.
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