Email Security in Houston
Almost every loss we get called about started in someone's inbox. Not a firewall breach, not a movie style hack: an email that looked like it came from a vendor, a partner, or the owner. Sentinel-Pros locks down the mail channel, proves your domain is yours, and makes the fraud attempts land in quarantine instead of accounts payable.
The Problem
The expensive attacks on Houston businesses are quiet. A criminal reads a compromised mailbox for three weeks, learns how your company words a payment request, then replies inside a real thread with new banking details, sometimes on a domain one letter off from your supplier's. Nobody clicks anything malicious. No malware runs. The wire goes out because the message was in the right conversation at the right moment of the month. Worse, if your domain has no sender authentication published, anyone in the world can send mail that appears to come from your executives to your own customers, and you will not learn about it until a client calls confused.
The Solution
Sentinel-Pros treats email as its own security domain rather than a setting inside your mail platform. We publish and enforce SPF, DKIM, and DMARC so spoofed mail carrying your name gets rejected, and we monitor the reports so legitimate senders like your CRM and accounting system do not break in the process. Inbound protection adds impersonation detection, link rewriting, and attachment sandboxing that opens files in isolation before your staff ever sees them. Encryption is configured for the messages that carry patient, financial, or contractual data. All of it is delivered remotely, and on-site sessions across the Houston metro are available when finance teams want the fraud walkthrough done in person.
Core Responsibilities
Inbound Defense
Owning Your Domain
Protecting the Mailbox Itself
Engagement Process
Mail flow audit
We map every system that sends mail as your company, review current filtering, and check whether your domain can currently be spoofed. Pricing is scoped on that discovery call as a fixed monthly retainer.
Authenticate the domain
Sender records are corrected and monitored, then moved to enforcement in stages. Legitimate senders are identified and authorized first so invoices and quotes keep arriving while forgeries stop.
Layer inbound protection
Impersonation rules, sandboxing, and link inspection go live, tuned to your vendors and your industry vocabulary so the filter understands what a normal purchase order from your suppliers looks like.
Drill the human step
Finance and operations get a short, specific verification routine for payment and banking changes, plus periodic simulated attempts so the routine is practiced before it is needed.
More for Houston Businesses
Common Questions
Microsoft 365 already filters spam. Why add anything?
The built in filters handle bulk spam and known malware well. They are weaker against targeted fraud that carries no attachment, no link, and no malware, which is the category that actually moves money. That gap is what the additional layer and the verification procedure address.
Will enforcing DMARC break our newsletters and invoices?
Not if it is staged. We start in a reporting mode, find every legitimate sender including the ones nobody remembers configuring, authorize them, and only then move to rejection. Rushing straight to enforcement is how companies silently lose their own mail.
A supplier's email account was hacked and the fraud came from their real address. Can that be stopped?
Partly. Filtering can flag thread hijacking and sudden banking language, but the reliable control is procedural: no payment detail ever changes without a callback to a number you already had on file. We put that rule in place and rehearse it with your finance staff.
We handle patient information. Does this cover the HIPAA side?
Encryption configuration, data handling rules, and audit evidence for the mail channel are part of the work, and they map to the HIPAA questions organizations near the Texas Medical Center ask their vendors. Email is only one part of a HIPAA program, and we will be straight with you about what remains open.
Do you need to move our mail somewhere else?
No. This runs on top of Microsoft 365 or Google Workspace where your mail already lives. There is no migration and no change to how your staff open their inbox.
Ready to get started?
BOOK A CONSULTATIONEmail Security for Houston, Texas
Houston runs on invoices between companies that have never met in person, which is the exact condition business email fraud needs. A drilling services vendor in the Energy Corridor bills an operator on net terms for work performed offshore, and the two accounting departments coordinate entirely by email. Freight forwarders, customs brokers, and terminal service firms around the Port of Houston exchange bills of lading, arrival notices, and payment instructions with counterparties on other continents and in other time zones, so a slightly wrong domain in a long thread is easy to miss. Construction and industrial contractors along the Ship Channel run change orders and progress billing through email attachments, and a redirected payment on a seven figure job is a company ending event for a subcontractor. Practices, imaging groups, and billing companies near the Texas Medical Center send protected health information by mail every day and answer to HIPAA for how it is handled. Professional services firms Downtown and in the Galleria move client funds and are impersonated precisely because their word carries authority. Then hurricane season arrives, offices close, approvals move to phones, and criminals send storm claim, emergency contractor, and relief fund messages into inboxes belonging to people who are tired and displaced. In this city, the inbox is the front door and it is where the money is.
See the statewide overview of Email Security or all services available in Houston.