Most small business owners have never heard of SPF, DKIM, or DMARC. That's completely normal — they're behind-the-scenes technical settings that nobody tells you about when you register a domain. But without them, your emails could be quietly landing in spam folders, or worse, someone could be sending fake emails pretending to be your business without you ever knowing.
They are three DNS records — small pieces of text added to your domain's settings — that tell the world's email systems whether to trust mail coming from your domain. Think of them as a three-layer security system for your business email.
SPF tells receiving mail servers which servers are allowed to send email on behalf of your domain. If an email arrives from a server that isn't on the list, it raises a red flag.
Think of it like a guest list at the door of a venue. Only approved servers get in.
DKIM adds a cryptographic digital signature to every email you send. The receiving server checks the signature to confirm the email genuinely came from you and wasn't tampered with in transit.
Like a wax seal on an important letter — if it's broken or missing, something is wrong.
DMARC ties SPF and DKIM together and tells receiving servers what to do when something fails. Quarantine it? Reject it outright? Just log it? Without DMARC, there's no instruction — and no enforcement.
SPF and DKIM check the credentials. DMARC decides what happens to anyone who fails the check.
All three need to work together. SPF alone can be worked around. DKIM alone doesn't cover all scenarios. And DMARC without the other two has nothing to enforce. Together, they form a complete shield.
This is where it gets real. Most business owners assume their email is "fine" because they can send and receive messages. But the problems caused by missing authentication often happen on the other side — in your clients' inboxes — where you'd never see them.
The particularly frustrating thing is that none of this shows up as an error on your end. You send an email and it looks fine to you. You just never hear back — because it never arrived.
Email authentication isn't standing still. The major email providers — Google, Microsoft, Apple — have been steadily raising the bar on what they consider trustworthy email. What was optional a few years ago is quickly becoming mandatory.
Both companies announced that bulk senders must have SPF, DKIM, and DMARC in place or their emails will be rejected outright. This was a major shift that affected businesses worldwide.
Even for smaller senders, email providers are increasingly using authentication as a trust signal. Unauthenticated domains are being treated with more suspicion every year.
The trend is clear: authentication is becoming the baseline expectation for legitimate email. The longer your domain goes without it, the more likely your emails are to be filtered, flagged, or blocked.
If someone spoofs your domain in the meantime and sends spam or phishing emails using your name, the reputational damage can take months to undo — and cleaning it up is far harder and more expensive than preventing it.
small businesses we've audited in Port Moody have at least one significant gap in their email authentication — most don't know until we check.
You can see the current state of your email authentication for free in about 30 seconds. Go to mxtoolbox.com/emailhealth, type in your domain name, and hit enter. It will show you exactly what's in place and what's missing — with red flags for anything that needs attention.
If anything is flagged in red or orange, your emails are at risk. If your DMARC policy says p=none, it means monitoring is in place but nothing is actually being enforced — your domain is still unprotected.
The fix involves adding or correcting DNS records in your domain's settings — typically through your domain registrar (GoDaddy, IONOS, Namecheap, etc.) or your hosting provider's control panel.
For domains where everything needs to be set up from scratch, the process involves creating an SPF record that covers all your email senders, generating and publishing a DKIM key, and creating a DMARC record with the right enforcement policy. Done correctly, it usually takes effect within 24–48 hours.
For domains where something is partially in place but misconfigured — like conflicting SPF records or a DMARC policy set to "none" — the work involves auditing what's there first, making sure nothing gets broken, and then tightening everything up properly.
It's not complicated once you know what you're doing — but if you get it wrong, you can break your email entirely. That's why it's worth having someone who does this regularly take care of it.
I check and fix email authentication for small businesses across Port Moody and the Lower Mainland. One flat fee, no ongoing contract, and it's done properly.
Get a Free Domain Check hello@inletdigital.ca · (672) 877-0093 · inletdigital.ca