How Houston Businesses Can Stop Email Spoofing Before It Costs Them a Client
Right now, with no special tools, someone could send an email that looks like it came from your company. The From line would show your domain. Your logo could appear in the message. And it could ask one of your clients—a medical practice, a law firm, or a construction subcontractor—to pay a fake invoice or update their banking details. Houston and its surrounding areas see a disproportionate volume of business email compromise attempts because the region is home to high-value industries: energy, healthcare, legal, and finance. An email that appears to come from a trusted vendor is one of the most effective ways fraud begins.
There are three settings you can add to your domain that make this far harder to pull off. They are called SPF, DKIM, and DMARC. Most Houston businesses have one or two of them in place and the third missing. That gap is often all it takes.
Why Any Business Can Have Its Email Spoofed
Email was designed in a more trusting era. The system that routes your mail does not, by default, verify that the sender is who they claim to be. The From address in an email is about as trustworthy as a handwritten return address on an envelope—anyone can write anything there, and the mail still moves.
A scammer puts your domain in the From field, sends the message from an unrelated server, and unless your domain is configured to reject it, the receiving mail server has no reason to question it. The message lands in your client’s inbox looking exactly like it came from you. For Houston healthcare providers, energy contractors, or law firms handling client funds, that is a serious exposure. Cybersecurity services in Houston have recorded a steady increase in business email compromise reports, and domain spoofing is the common entry point.
The Three DNS Records That Stop Email Spoofing
Three DNS records work together to prove an email actually originated from your domain. You configure them once at your domain registrar or DNS host, and receiving mail servers check them automatically on every message you send.
1. SPF (Sender Policy Framework)
SPF publishes a list of the mail servers that are permitted to send email for your domain. When a message arrives claiming to be from you, the receiving server checks whether the sending server appears on that list. A server not on the list gets flagged.
2. DKIM (DomainKeys Identified Mail)
DKIM adds a tamper-proof digital signature to every outgoing message. Your mail server signs it with a private key; the matching public key lives in your DNS. The receiving server checks both that the message came from your domain and that nothing was altered in transit.
3. DMARC (Domain-based Message Authentication, Reporting & Conformance)
DMARC ties SPF and DKIM together and tells receiving servers what to do when a message fails both checks. Critically, it also verifies that the domain in the visible From address matches the domain that SPF and DKIM authenticated—which is the check that stops someone from forging your exact address. DMARC also sends you reports showing every server that sends using your domain, including the ones that should not be.
The DMARC Setting Most Houston Businesses Get Wrong
DMARC operates in three modes, and choosing the wrong one is one of the most common managed IT oversights for Houston companies.
p=none — monitors and sends reports, but your domain remains spoofable. Receiving servers do nothing when a message fails.
p=quarantine — sends failing messages to the recipient’s junk folder. Protection begins here.
p=reject — blocks failing messages before they are delivered. This is full protection.
Many businesses configure DMARC at p=none, watch the reports for a while, and never move past it. At none, you have visibility but no protection. Since February 2024, Google and Yahoo have required bulk senders to have SPF, DKIM, and DMARC in place. For businesses that send transactional or marketing email, being caught with p=none affects deliverability as well as security. For a deeper look at why email authentication matters, see our earlier post on why email authentication is now critical for your business.
What These Records Still Won’t Stop
SPF, DKIM, and DMARC protect your exact domain. Two techniques fall outside that protection.
Lookalike domains: A scammer can register a domain that resembles yours—yourcompanytx.com instead of yourcompany.com—and send from that. Your records cover your real domain, not one an attacker controls.
Display-name spoofing: The sender name can read “Your Company Finance” while the actual email address is a random Gmail account. DMARC checks the domain, not the display name. The right safeguard here is staff awareness and payment verification habits: always confirm a request to change banking details by calling a known number, never one from the email itself.
What Elevate Technology Delivers for Houston Cybersecurity
Elevate Technology configures and manages email security for businesses across Houston, Katy, and Sugar Land—including proper SPF, DKIM, and DMARC deployment as part of a layered managed cybersecurity services approach. For clients using Proofpoint—Elevate Technology’s recommended email security platform—that means inbound threat filtering, impersonation detection, and ongoing monitoring of email authentication health. Whether you are a Houston healthcare group managing HIPAA obligations or a law firm protecting client communications, the goal is the same: make it harder for an attacker to impersonate your domain, and harder for your team to fall for one that does.
What is email spoofing, and why do Houston businesses need to worry about it?
Email spoofing is when a scammer sends a message with your domain in the From field to make it look like it came from your company. It is used to trick clients, suppliers, or staff into paying fake invoices or disclosing sensitive information. Houston businesses in energy, healthcare, finance, and legal services are frequently targeted because of the high-value transactions those industries handle daily.
Will setting up DMARC break our outgoing email?
Not if you do it in stages. Starting at p=none lets you read the authentication reports and confirm that all legitimate mail passes before you move to quarantine and then reject. Jumping straight to reject without that diagnostic step is what causes delivery problems. A managed IT provider in Houston who handles the rollout ensures your outgoing mail is never disrupted in the process.
→ See how Elevate Technology protects Houston businesses from email-based threats. Visit our Proofpoint Email Security page.
