Email authentication for Treasure Coast businesses
If customers say your messages landed in spam, or you are worried someone is sending mail that looks like it came from you, the work often starts with three DNS records: SPF, DKIM, and DMARC.
Reviewed by Rich Timmons, Founder and CEO. Last reviewed: November 5, 2026.
Titan IT Management sets up, repairs, and monitors SPF, DKIM, and DMARC on an ongoing basis for businesses we support. We do this as email authentication work, not as a branded product. The goal is straightforward: make your domain harder to spoof, and make legitimate mail more likely to be accepted.
This is not a guarantee that every message will reach the inbox. Receiving providers still judge reputation, content, and engagement. It is also not a complete defense against business email compromise. If an attacker takes over a real mailbox, that mail can still authenticate. Compliance must come before claim.
What SPF, DKIM, and DMARC actually do
SPF (Sender Policy Framework)
SPF is a public list of the systems allowed to send email for your domain. If a message comes from a system that is not on that list, receiving mail servers can treat it as suspicious.
DKIM (DomainKeys Identified Mail)
DKIM adds a digital signature to a message. It helps the receiving server confirm the message was authorized by your domain and was not altered in transit.
DMARC (Domain-based Message Authentication, Reporting, and Conformance)
DMARC builds on SPF and DKIM. It tells receiving servers what to do when a message fails those checks, and it can provide reports about who is sending mail that claims to be you.
These three records work together. One of them set up in isolation is usually not enough.
What Titan does
- Set up SPF, DKIM, and DMARC when they are missing or incomplete.
- Repair records that are wrong, outdated, or left in a weak state.
- Monitor the records on an ongoing basis, so a new mailing tool, website form, or host change does not quietly break delivery or protection.
- Explain what we found in plain English, including what the records can and cannot do.
We look at the domains you actually send from, including common extras such as a billing domain or a marketing domain, and we tell you which ones need work.
Included on managed plans per agreement, and quoted per domain otherwise.
What this does not do
- It does not guarantee inbox placement. A correct record set helps, but it cannot override a poor sending reputation or a filter on the other end.
- It does not stop every form of impersonation. Look-alike domains and display-name tricks can still fool a person.
- It does not protect a mailbox that has already been taken over. That problem is about sign-in security, including MFA, leftover logins, and unowned admin accounts.
- It does not replace email filtering, backup, or a cyber insurance review.
If mail is already bouncing or landing in spam, we will say what the records explain and what they do not. We will not claim a fix we cannot stand behind.
How this fits with Microsoft 365
Most of the offices we support send mail through Microsoft 365. Email authentication is part of keeping that tenant in good shape, alongside MFA, admin access reviews, and Microsoft 365 backup. If you are not yet a Titan client, you can also start with a free 30-minute IT and access review if you want written findings on leftover logins, MFA gaps, and backup restore-test status before any other work is scoped.
Related pages:
Email authentication questions, answered
Why is my email going to spam or bouncing?+
There are several common causes. Missing or incorrect SPF, DKIM, or DMARC records are one of them. Others include the content of the message, the reputation of the sending service, a full mailbox, or a typo in the address. We start by checking the authentication records, then tell you plainly whether they are the likely issue or only part of it.
What is DMARC in plain English?+
DMARC is a policy you publish for your domain. It tells other mail systems how to handle messages that claim to be from you but fail SPF or DKIM, and it can send you reports about those messages. It is a control, not a stamp of approval, and it only works if SPF and DKIM are also set up correctly.
If we publish a DMARC policy, can someone still pretend to be us?+
They can still try. DMARC makes it harder to send mail that appears to come from your exact domain. It does not stop a look-alike domain, a forged display name, or an attacker who has signed in to a real mailbox. Those risks need MFA, access reviews, and payment-verification habits alongside email authentication.
Do you only set the records once, or do you keep watching them?+
We set up and repair the records, and we monitor them on an ongoing basis. Mail systems change. A new website form, newsletter tool, or invoice service can break a record if it is not added correctly.
Is this included with managed IT, or is it priced separately?+
Included on managed plans per agreement, and quoted per domain otherwise.
Will this help with a cyber insurance application?+
Applications often ask whether email authentication is in place. We can tell you what is actually configured and help you describe it accurately. We do not guarantee coverage, eligibility, premiums, or claim outcomes, and this is not insurance or legal advice. Compliance must come before claim. If you want help with the questionnaire itself, we will go through it with you, line by line.
Serving the Treasure Coast
Titan IT Management is locally owned, family- and veteran-owned, and based in Stuart. We support businesses across Martin, St. Lucie, Indian River, and Okeechobee counties, plus northern Palm Beach County, including Vero Beach, Port St. Lucie, Fort Pierce, and nearby communities.