Email has been around for decades. Unfortunately, so have people trying to use it to steal your details, identity, and money.
For MSPs, protecting clients from email threats means dealing with everything from obvious spam and malicious attachments to convincing phishing emails, compromised accounts, and business email compromise (BEC).
No single security tool can catch everything. Effective email security for MSPs needs layers: technical defenses to stop threats, trained users to recognize what gets through, and efficient processes to investigate suspicious messages when they’re reported.
Cybersecurity defenses keep improving. Unfortunately, attackers aren't sitting around waiting patiently for the good guys to catch up.
The 2026 Verizon Data Breach Investigations Report found that exploitation of vulnerabilities has overtaken stolen credentials as the most common initial access vector, accounting for 31% of breaches. But the human element remains a major part of the threat landscape, including social engineering, phishing, credential abuse, and human error. Third-party involvement also increased significantly, appearing in 34% of breaches in the financial and insurance sector and 48% of breaches overall, according to Verizon's headline findings.
The FBI's 2025 Internet Crime Report paints a similarly expensive picture. IC3 received 1,008,597 complaints during 2025, with reported losses totaling $20.877 billion. Business email compromise alone accounted for 24,768 complaints and more than $3 billion in reported losses.
AI is making the problem more complicated. IC3 received more than 22,000 complaints containing AI-related information in 2025, representing more than $893 million in reported losses. The FBI also reported more than $30 million in losses specifically from BEC scams involving AI.
That's significant because many modern email threats don't feature a suspicious attachment or an obviously malicious URL. Generative AI can help attackers create convincing emails, imitate writing styles, build believable pretexts, and carry on conversations that look legitimate.
For an MSP protecting thousands of users across multiple organizations, that creates an enormous attack surface. Every client brings employees, vendors, third parties, email accounts, and relationships that attackers can potentially exploit.
Security is only half of the email security challenge for MSPs. The other half is delivering that security efficiently across dozens or hundreds of clients.
A task that takes ten minutes doesn't sound particularly concerning until it’s time to repeat it for another 49 tenants.
Separate configurations, manual onboarding, individual policies, recurring campaign administration, tenant-by-tenant reporting, and repetitive investigations all add up. Alert fatigue and false positives can also make it harder for technicians to identify the incidents that genuinely need their attention.
Security awareness training is a good example. Phin's published figures show MSPs can spend more than six hours per client each month setting up and managing SAT when processes aren't sufficiently automated.
That goes beyond inconvenience. Technician time spent on repetitive administration is time they can't spend on higher-value, billable work. Unnecessary escalations tie up senior engineers and reduce profitability. Slow investigations affect client experience. And if every new client creates the same amount of manual work as the last, growing the business can mean growing headcount just to keep up.
MSPs also need to prove that their security services are actually working. Client-facing reporting should show meaningful outcomes, behavior change, reduced risk, training engagement, compliance support, and long-term improvement, rather than just another dashboard full of numbers nobody looks at.
Technical email protection should form the first layer of any effective email security strategy.
That includes:
These controls matter, but they can't remove every possible threat.
Business email compromise may come from a legitimate but compromised account. An impersonation attempt might contain no malware at all. A carefully constructed social engineering email may simply ask an employee to change payment details, share information, or perform another seemingly reasonable task.
At that point, the problem is no longer just whether your email gateway can identify a malicious payload. You need to answer two more questions: what does the user do when something suspicious reaches their inbox, and what does your team do when they report it?
Effective security awareness training gives users the knowledge and habits they need when technical defenses aren't enough. And to be clear, that doesn't mean boring your employees senseless with one annual cybersecurity extravaganza that takes up a whole working day, then hoping they remember it eleven months later.
Training should be continuous, relevant, and supported by realistic phishing simulations that give users opportunities to practice recognizing threats. Just as importantly, users should know exactly how to report something suspicious when they aren't sure.
For MSPs, the delivery model matters too. Training across multiple clients can create a substantial administrative burden if technicians have to configure every campaign, update every user list, chase every completion, and produce every report manually.
Automation changes the economics and the efficiencies.
Phin data shows MSPs reducing SAT setup and management from more than six hours per client per month to 20 minutes or less, representing a 94% time saving. Across Phin partners, phishing simulation click rates decrease by an average of 41% within the first year.
Long-term customer results show what that can look like in practice. Kelley Create uses Phin across 148 clients and more than 6,400 active users. Between month one and month 36, its overall phishing click rate decreased by 72.66%, while ongoing SAT management fell to almost zero hours per year.
That's the combination MSPs should be looking for: measurable improvement in user behavior without creating an equally measurable increase in administrative work.
Getting users to report suspicious emails is a win. Then somebody has to investigate them.
A typical reported email creates a ticket that needs to be classified as legitimate, spam, suspicious, or malicious. Without the right information readily available, an L1 technician may need to inspect headers, analyze links, check sender information, switch between multiple tools, or escalate the ticket to a senior engineer. Multiply that process by hundreds of reported messages and it quickly becomes expensive.
Effective phishing analysis should give technicians the context they need in one place, including severity assessments, sender information, header analysis, URL context, and other relevant investigation data. That's what Phinbox IQ is designed to do. It brings phishing analysis into the help desk so technicians can investigate reported emails without constantly switching tools.
Certified CIO reduced engineering time spent investigating reported emails from 15 minutes to three minutes per email, an 80% reduction, with nearly all incidents subsequently resolved by L1 technicians and very few requiring escalation.
Krantz Secure Technologies saw similar results. After implementing Phinbox IQ, investigation time dropped from around 15 minutes to five minutes per reported email while handling 200 to 300 reports each month.
Filtering and phishing analysis solve different problems. Filtering tries to prevent malicious email from reaching users. Phishing analysis helps your team respond quickly and confidently when a suspicious message has already arrived and been reported. A layered email security strategy needs both.
Not every security platform that works for an individual business works equally well for an MSP.
When you're evaluating your security stack, look beyond the feature list and consider how each tool behaves when you multiply it across your entire client base.
Ask:
A platform might have an impressive list of features and still create an operational headache. The real test is whether it helps your MSP deliver better security to more clients without creating more repetitive work for your team.
There is no single button that solves email security.
Effective protection combines technical email controls with identity security, security awareness training, phishing simulations, simple user reporting, and fast investigation when suspicious messages make it through. For MSPs, those layers also need to work at scale.
The right security stack should make it easier to protect your next client than your first. Centralized management, automation, useful integrations, clear reporting, and efficient phishing analysis can reduce repetitive administration and unnecessary escalations while giving clients greater visibility into the value you're delivering.
Phin helps MSPs tackle the human and operational sides of that equation with automated security awareness training, phishing simulations, simple reporting, and Phinbox IQ phishing analysis.
Email security for MSPs combines technical email protection, identity controls, security awareness training, phishing simulation, user reporting, and threat response across multiple client environments. Effective MSP email security should protect users while remaining manageable across many separate tenants.
No. Security awareness training can reduce human risk and help users recognize and report suspicious messages, but it should work alongside technical email controls, identity security, phishing protection, and rapid threat response.
Email filtering attempts to identify and block suspicious or malicious messages before or around delivery. Phishing analysis evaluates emails that users have already received and reported, helping technicians determine whether a message is legitimate, spam, suspicious, or malicious.
Multi-tenant capabilities allow MSPs to manage users, policies, reporting, training, and security workflows across multiple clients from a centralized environment. This reduces the need to repeat the same administrative work separately for every tenant.
MSPs should prioritize security awareness training that combines realistic phishing simulations and ongoing user education with automation, multi-tenant management, measurable reporting, simple onboarding, and minimal recurring administration.