Small businesses are now the number one target for email-based attacks. According to the FBI's 2023 Internet Crime Report, Business Email Compromise (BEC) alone caused $2.9 billion in verified losses — with small and mid-sized businesses accounting for the majority of victims. More alarming: 60% of SMBs that suffer a significant cyber attack close within six months. Unlike enterprises, small businesses lack dedicated IT staff, security budgets, and the institutional skepticism that comes from ongoing security training. That makes email the most exploited attack vector in the SMB landscape — and the one most likely to cause irreversible damage.
Key statistic
The FBI IC3 2023 report recorded 21,489 BEC complaints with adjusted losses exceeding $2.9 billion. The average loss per incident was $137,132 — a figure that is catastrophic for a business with fewer than 20 employees.
Why Small Businesses Are the Preferred Target
Attackers follow incentives. Small businesses represent an attractive combination of accessible targets, limited defenses, and real financial assets — wire transfer authority, payroll systems, vendor payment accounts, and customer data that can be monetized.
Security investment gap
Enterprise companies spend thousands per employee per year on email security tooling, incident response teams, and ongoing training. The average SMB spends close to zero. Attackers know this and adjust their targeting accordingly.
Employee email habits
In a small team, everyone is busy doing multiple jobs. Finance staff answer vendor emails quickly to avoid delays. Operations staff click links in tracking notifications without pausing. The pace of small business creates the perfect conditions for a well-timed phishing email.
Business Email Compromise (BEC)
BEC is the dominant attack vector against SMBs. An attacker compromises or impersonates an executive's email account and instructs a finance employee to wire funds, change payroll bank details, or pay a fraudulent invoice. Unlike malware, BEC requires no technical exploit — just a convincing email and the right moment of distraction.
High trust, low verification
Small teams operate on trust. When an email arrives that appears to be from the CEO, an employee rarely calls to verify. That implicit trust is the vulnerability attackers exploit.
The 6 Most Common Email Attacks Against SMBs in 2026
Threat actors have refined their SMB playbooks. These are the six attack types that security teams are documenting most frequently against businesses with fewer than 50 employees:
Invoice fraud (vendor impersonation)
The attacker registers a domain that looks like a real vendor's domain (e.g., acme-invoices.com instead of acme.com) and sends a realistic invoice with updated bank account details. The business pays. The vendor never receives the money. These attacks are timed to coincide with known billing cycles, obtained through open-source intelligence on the company.
Payroll redirect (HR compromise)
An employee — or someone impersonating an employee — emails HR or the payroll administrator asking to update their direct deposit details. The new account belongs to the attacker. The employee doesn't discover the fraud until payday. Recovery is difficult because the funds have already been moved.
CEO/CFO impersonation (classic BEC)
An email arrives from what appears to be the CEO or CFO requesting an urgent wire transfer. The email uses a display name spoofed to match the executive and often references a real business context — a deal closing, a supplier needing immediate payment. The attacker relies on authority and urgency to suppress the recipient's skepticism.
Fake DocuSign and contract requests
Attackers send emails mimicking DocuSign, Adobe Sign, or other e-signature platforms. The document link leads to a credential harvesting page. Once the attacker has the employee's Microsoft 365 or Google Workspace login, they have full access to internal email — enabling more sophisticated follow-on attacks.
Tax season phishing (IRS/HMRC impersonation)
Between January and April, SMB inboxes are flooded with emails impersonating the IRS, HMRC, or state tax agencies. These emails claim there is an error on a recent filing, a payment due, or a refund awaiting collection. The tax season context creates just enough plausibility for employees to click without thinking.
AI-generated spear-phishing
The newest and most dangerous variant. Attackers use publicly available information — LinkedIn profiles, company websites, press releases, social media — to generate highly personalized phishing emails using large language models. The emails reference real colleagues, real projects, and real business context. Standard filters have no pattern to match against because every email is unique.
What Standard Solutions Miss
The market for email security is not lacking in products. The problem is that most products were built for one of two audiences: consumers (who need spam filtering) or enterprises (who have IT departments, SIEM integrations, and $25+/user security budgets). Small businesses fall into neither category.
Gmail spam filters
Google's built-in filters are effective at catching bulk commercial spam. They are not designed for targeted BEC. A single, carefully crafted email from a lookalike domain with no prior spam history will sail through Gmail's filters without any flag.
Microsoft Defender for Office 365
Microsoft's advanced threat protection is genuinely capable — but it requires Microsoft 365 Business Premium at $22/user/month. For a 10-person team, that is $2,640/year before you factor in the M365 licensing costs. It also requires IT configuration to operate correctly.
ProtonMail and privacy-first providers
Excellent for privacy. Not built for threat detection. ProtonMail's security is about encryption in transit and at rest — it does not provide behavioral analysis, BEC detection, or a gatekeeper model for flagging suspicious requests.
Abnormal Security and enterprise tools
Abnormal Security is legitimately excellent at BEC detection. It is also priced for the enterprise market at $25+/user with a minimum contract requirement that no five-person business can justify. The capability gap for sub-50-employee businesses is real and deliberately unaddressed.
The gap
Sub-10-employee businesses — the backbone of the economy — have no enterprise-grade email security option that does not require an IT department to deploy, a 12-month contract to sign, or a per-user cost that rivals their SaaS subscription budget.
The Right Architecture for SMB Email Defense
Effective SMB email security does not need to be complex. It needs to be layered, fast, and built around the way small teams actually work. Glance's 4-tier detection engine was designed with exactly this constraint in mind.
Tier 1 — Deterministic (0ms)
Every email is checked against your personal allowlist and blocklist, plus a global blocklist of confirmed scam domains. Known-safe senders are delivered instantly. Known-bad senders are blocked before any processing occurs. No compute, no latency, no false positives on trusted senders.
Tier 2 — Heuristics (<50ms)
SPF, DKIM, and DMARC authentication are verified. Domain age is checked — newly registered domains are a strong BEC signal. Homoglyph detection catches lookalike domains (acmе.com using a Cyrillic 'e'). Suspicious keyword patterns flag urgency language associated with wire transfer fraud.
Tier 3 — Reputation scoring
Crowd-sourced reputation data from across the Glance network identifies senders that other users have flagged. A vendor impersonating a known logistics company will have already been reported by other businesses before it reaches your inbox. The network effect improves with scale.
Tier 4 — AI deep scan
For emails that pass Tiers 1-3 but remain ambiguous, AI semantic analysis evaluates intent — not just content. This is the layer that catches the AI-generated spear-phishing attacks that have no detectable pattern. It runs only when needed, preserving both privacy and speed.
Circle of Trust for BEC Prevention
The Circle of Trust model adds a human checkpoint that no automated system can fully replace. When an email arrives from an unknown sender requesting a wire transfer, a contract signature, or a change to payment details, the recipient sees the threat score before acting — and can escalate to a designated gatekeeper for a second opinion.
In practice, this means that even a perfectly crafted BEC email — one that bypasses every automated filter — is met with a visible threat score and a prompt to verify before transferring funds. The one-second pause this creates is enough to prevent the majority of successful attacks.
Privacy note
Glance's zero-persistence architecture means email bodies are scored ephemerally in memory, then discarded — never stored. Threat analysis derives signals from metadata, headers, and sender reputation. Your business communications remain private by design, not policy.
Setting Up Email Protection for Your Small Business: A Checklist
These seven steps can be completed in under an hour for a team of any size. No IT department required.
- 01
Enable SPF, DKIM, and DMARC on your domain
These three DNS records authenticate your outbound email and prevent others from spoofing your domain. Your domain registrar (GoDaddy, Cloudflare, Namecheap) has step-by-step guides. This is free and takes 15 minutes. Without these records, your own domain can be impersonated.
- 02
Connect your business email to Glance
Glance connects to Gmail (personal or Google Workspace) and Microsoft 365 / Outlook via secure OAuth. No password sharing, no mail forwarding rules, no DNS changes. Authorization takes under two minutes per account.
- 03
Designate gatekeepers for high-risk roles
Anyone with wire transfer authority, payroll access, or vendor payment responsibility should have at least one gatekeeper — a trusted colleague or manager who receives alerts when a flagged email arrives. This creates the human checkpoint that stops BEC.
- 04
Configure your auto-block threshold
Set the threat score above which emails are automatically quarantined without reaching the inbox. Glance recommends a threshold of 85 for most small businesses — aggressive enough to stop high-confidence attacks, conservative enough to avoid blocking legitimate email.
- 05
Set sensitivity level by role
Finance and HR roles should run at higher sensitivity than general staff. Glance lets you configure per-account sensitivity so that the people most likely to receive BEC attempts get the most aggressive protection.
- 06
Enable weekly threat digest
The weekly digest summarizes every email that was flagged, blocked, or quarantined that week. This gives the business owner visibility into what the system is catching without requiring daily monitoring.
- 07
Review your sender allowlist monthly
Add verified vendors, partners, and clients to the allowlist so their emails are never flagged. Review the list monthly to remove vendors you no longer work with — stale allowlist entries are a low-probability but real attack surface.
Glance is free to start and requires no IT configuration. Connect your first business email account in under five minutes and see your threat landscape in real time.
Frequently Asked Questions
Does Glance work with Google Workspace and Microsoft 365?
Yes — connect any Gmail or Outlook account via secure OAuth. Works for personal accounts and business accounts under any domain. No DNS changes or mail routing configuration required.
How long does setup take for a team?
Under 10 minutes per account. There is no IT configuration required. Each team member connects their own email account independently using the same OAuth flow.
Will this slow down our email?
No. Tiers 1-3 run in under 50ms. Emails are delivered instantly — the threat score is computed in parallel with delivery, not before it. You will not notice any latency.
What happens if Glance marks a legitimate business email as suspicious?
The sender gets quarantined, not deleted. You can release it in one click from your dashboard or from the notification you receive, and add the sender to your allowlist permanently so future emails are never flagged again.
Your Business Deserves Enterprise-Grade Protection
Stop BEC, invoice fraud, and AI-generated spear-phishing before they reach your team. Free to start. No IT required. No annual contract.