Outbound Email Security: Two Layers of Protection for Client Data
Outbound Email Security Is Built Into PartnerCare
Outbound email security isn’t something most people think about — until an email lands somewhere it shouldn’t. A Social Security number ends up in a message meant only for internal eyes. A compromised account starts firing off links to hundreds of contacts before anyone notices something’s wrong. Neither should depend on someone catching it in time. That’s why, for PartnerCare clients, we protect every outbound email two ways — one layer that catches sensitive data before it leaves the inbox, and one that stops a hijacked account before it can reach a client.
The Problem: What Happens When the Wrong Email Goes Out
Email is still where the most sensitive information in your firm travels every day — tax documents, case files, wire instructions, Social Security numbers, financial statements. Most of the time, nothing goes wrong. But it only takes one rushed send, one auto-fill mistake, or one compromised account to turn a routine email into a real problem. Businesses reported nearly $8.5 billion in losses to business email compromise between 2022 and 2024 alone, according to the FBI’s Internet Crime Complaint Center, with $2.8 billion of that in 2024 alone. Almost none of it started with anything more dramatic than someone hitting send — which is exactly the moment PartnerCare is built to catch.
Layer One: Catching Sensitive Data Before It Leaves Your Inbox
We strengthen outbound email security by automatically scanning every outgoing email for the kind of content that shouldn’t leave the building unchecked — Social Security numbers, other personal information, and certain business-sensitive data. If nothing is flagged, your email goes out exactly as it always has, with no extra steps. If something is flagged, delivery pauses and you receive a confirmation message in which you can approve the email as written, deny it, or review the full message before deciding. If you genuinely need to send something sensitive, denying and resending with “(encrypt)” added to the subject line routes it through encrypted delivery instead — no new software, no new habits to learn. We’ll walk through this layer in more detail — including what it means for firms handling client financial documents — in an upcoming post.
Layer Two: Stopping a Hijacked Account in Its Tracks
This layer works differently. Instead of scanning content, it watches behavior. If an account suddenly starts sending to hundreds of contacts within a couple of minutes, or those messages contain a dangerous link or phishing-style language, that pattern gets flagged as a possible account takeover. When it is, outgoing messages from that account are automatically held and an administrator is notified immediately — able to review, approve, or reject the messages, and clear the account once it’s confirmed safe. It’s the difference between finding out your account was compromised after a client calls to ask about a strange email, and catching it in the two minutes it would have taken to cause damage. We’ll dig into exactly how this detection works — and the scam patterns it’s built to catch — in a follow-up post, building on what we’ve already covered about law firm wire fraud scams.
| Want This Level of Protection for Your Firm? Both of these layers are included automatically for Slingshot PartnerCare clients — no extra setup required. → What You Get with Slingshot PartnerCare — see everything that’s included. → Get Help Now — talk to us about protecting your firm’s email. |
What This Means for Your Day-to-Day
Neither of these layers changes how you use email. There’s no new form to fill out, no extra login, no workflow to memorize. The vast majority of what you send will go out exactly as it always has, instantly, with no confirmation step at all — these layers only step in when something in the message or the sending pattern actually warrants a second look. That’s on purpose. Security that gets in the way of your day gets worked around; security that works quietly in the background is the kind that actually protects you. It’s the same reason accidentally handing client secrets to AI tools has become its own risk to manage — the goal isn’t more steps, it’s fewer chances for a mistake to become a headline.
Frequently Asked Questions
What is outbound email security?
Outbound email security is the automatic scanning of every email you send for sensitive content — like Social Security numbers, financial details, or other business-sensitive data — before it leaves your inbox. If nothing is flagged, the email goes out normally. If something is, delivery pauses for a quick review.
Why does outbound email security matter?
Outbound email security helps protect your clients, your business, and your reputation from threats that originate from your own email accounts. It can prevent sensitive information from being sent insecurely and detect unusual sending behavior that may indicate an employee’s email account has been compromised.
What is the difference between inbound and outbound email security?
Inbound email security protects your employees from threats coming into their inboxes, such as phishing, malware, and malicious links. Outbound email security protects sensitive information and helps detect suspicious messages leaving your organization. Businesses need both because email threats can come from outside the organization—or from a compromised account on the inside.
What happens if I accidentally email a client’s Social Security number or other sensitive information?
If the outbound scan flags the message, delivery is paused automatically and you’ll receive a confirmation email where you can approve it (if it was intentional or a false positive), deny it (if it was a mistake), or review the full message first. Nothing reaches the recipient until you decide.
What does adding “(encrypt)” to a subject line do?
Typing “(encrypt)” into a subject line routes that email through encrypted delivery instead of the standard scan-and-confirm process. It’s the fastest way to resend a message that legitimately needs to include sensitive information after a Deny Delivery decision, without triggering another confirmation.
How do I know if my email account has been hacked?
Account takeover detection watches for suspicious sending behavior — for example, an account suddenly emailing well over a hundred contacts within a couple of minutes, or messages containing a dangerous link or phishing-style language. When that happens, outgoing messages are automatically held and an administrator is notified right away, often before anyone outside the firm sees anything unusual.
More Protection, Less to Think About
Together, these two layers are about protecting client data without adding friction to your day: outbound email security works quietly in the background on every message you send — catching sensitive data before it leaves the building, and catching a hijacked account before it can do damage. Over the next two weeks, we’ll go deeper on each layer: how the sensitive-data scan matters specifically for firms handling financial documents, and exactly how we catch a compromised account before it ever reaches a client. If you have questions about either layer in the meantime, reach out to Slingshot — we’re happy to walk through it. And if you want a broader read on where your firm’s risk actually sits, our free IT Risk Scorecard takes about three minutes.
