Solo IT admins at SMBs must manually piece together containment, investigation, and remediation steps during an active email compromise — pulling sign-in logs, running message traces, searching mailboxes with Purview, and writing PowerShell scripts to purge malicious emails — all under pressure with no one to escalate to.
A SaaS tool that connects to M365 via API, continuously monitors for compromise indicators (anomalous sign-ins, mass email sends, suspicious OAuth consents, new MFA registrations), and when triggered provides a guided runbook with one-click actions: revoke sessions, reset credentials, quarantine malicious emails tenant-wide, kill sharing links, and generate a post-incident report.
This is hair-on-fire pain. The Reddit post you sourced is a textbook example — a solo admin under active attack, frantically Googling, running unfamiliar PowerShell, manually searching 82 mailboxes. BEC is the #1 cybercrime loss category. When it happens, there is zero room for error and the admin is utterly alone. The 126 upvotes and 116 comments confirm this resonates deeply. This pain is acute (not chronic), high-stakes (data breach, financial loss, job loss), and recurring (BEC attempts happen constantly). The only reason it's not a 10 is that the pain is episodic — most days the admin isn't actively compromised.
There are roughly 1-2M SMBs (50-500 employees) running M365 globally. At $199-499/month, even capturing 0.5% (5,000-10,000 customers) yields $12M-$60M ARR. TAM is probably $500M-$1B if you include the full SMB M365 segment. However, this is a niche within a niche — M365-only, SMB-only, incident-response-focused. It's a great venture-scale niche but not a massive horizontal market. Expansion into MSP channel could 3-5x the addressable market.
SMBs already pay $5-15/user/month for email security add-ons. At $199-499/month flat, you're competing favorably with per-user pricing for 50-500 seat orgs. Cyber insurance increasingly requires incident response capabilities, creating a compliance forcing function. The challenge: SMBs notoriously underinvest in security until AFTER an incident, so conversion may depend on fear-based marketing or insurance mandates. The 'free monitoring tier' is smart — it lets you prove value before the incident happens. Post-incident, willingness to pay is 10/10 but pre-incident it drops to 5-6.
Microsoft Graph API provides rich access to sign-in logs, audit logs, mail flow, mailbox content, and admin actions (session revocation, password reset, mail purge). The core detection logic (anomalous sign-ins, mass sends, suspicious OAuth) is well-understood and pattern-matchable without deep ML. One-click remediation actions map directly to Graph API endpoints. A solo dev with M365 admin experience could build a functional MVP in 6-8 weeks. Challenges: Graph API rate limits, handling delegated vs application permissions across tenants, and the Purview/Content Search API which is notoriously janky. Not trivial but very doable.
This is the strongest signal. Current competitors fall into two camps: (1) email security tools that prevent threats but don't handle post-compromise response, and (2) SIEM/MDR platforms that detect but require MSPs or security expertise to act on. NOBODY is offering a self-service, guided, one-click BEC incident response workflow specifically for solo IT admins without security expertise. Huntress is closest but is MSP-only. Defender AIR is closest technically but is a confusing black box. The 'guided runbook + one-click actions + post-incident report' combination is genuinely unserved.
Continuous monitoring is inherently subscription. Once connected to a tenant, the tool provides ongoing value (threat detection) even when no incident is active. The free monitoring tier creates a natural upgrade path when an incident occurs. Churn risk is low — disconnecting a security tool feels dangerous. Expansion revenue is natural: more mailboxes, more tenants (for MSPs/IT consultants managing multiple clients). Cyber insurance compliance creates annual renewal pressure. This has SaaS DNA.
- +Validated acute pain with real user evidence — the Reddit post is practically a product spec written by a desperate customer
- +Clear competition gap: no one owns the 'self-service BEC incident response for solo admins' category
- +Strong technical feasibility via Microsoft Graph API — the platform wants you to build this
- +Natural freemium motion: free monitoring converts to paid when the inevitable incident happens
- +Regulatory/insurance tailwinds are creating forced demand for exactly this capability
- +Flat monthly pricing ($199-499) is compelling vs per-user competitors at scale (50-500 seats)
- +High switching costs once embedded — security tools are sticky by nature
- +MSP channel expansion is a natural Phase 2 growth vector
- !Microsoft could build this natively into Defender or Security Copilot, especially the guided runbook concept — they've been aggressively expanding Security Copilot capabilities
- !SMB sales cycles for security tools are long pre-incident; customer acquisition cost may be high without a channel (MSP) strategy
- !Graph API permission requirements (full mailbox access, admin consent) may create trust/compliance friction for security-conscious buyers — ironic for a security product
- !Huntress could move downmarket to direct-SMB or add self-service remediation, and they have massive distribution advantage
- !Incident response is episodic — if your tool prevents incidents too well, the high-value remediation features rarely activate, making ROI harder to demonstrate
- !Microsoft Graph API rate limits and reliability issues could cause failures at the worst possible moment (during an active incident)
MSP-focused platform that monitors M365 tenants for suspicious activity including malicious inbox rules, OAuth app abuse, anomalous logins, and email threats. Provides human-reviewed threat detection with SOC analyst validation before alerting.
Cloud SIEM with M365 integration that detects suspicious sign-ins, impossible travel, mail flow anomalies, and privilege escalation. Offers a free tier for up to 3 cloud integrations with basic detection.
Microsoft's native email security add-on with Safe Links, Safe Attachments, anti-phishing policies, automated investigation and response
API-based email security that sits inline with M365 via Graph API. Uses AI to detect phishing, BEC, and account takeover before messages reach the inbox. Acquired by Check Point.
AI-powered email security platform with automated phishing detection, incident response workflows, and end-user phishing simulation training. Integrates with M365 via API.
Week 1-2: Build M365 tenant onboarding via OAuth app registration with Graph API permissions (AuditLog.Read.All, Mail.ReadWrite, User.ReadWrite.All, Policy.ReadWrite). Week 3-4: Implement core detection engine — anomalous sign-in locations, impossible travel, mass email sends (>50 in 10 min), suspicious OAuth app consents, new MFA method registrations. Week 5-6: Build the incident response dashboard — when a compromise is detected, present a guided runbook with one-click actions: revoke all sessions, force password reset, disable account, search and purge malicious emails across all mailboxes, revoke suspicious OAuth consents, disable mail forwarding rules. Week 7-8: Add post-incident report generation (PDF) summarizing timeline, affected users, actions taken, and recommended hardening steps. Ship the free monitoring tier (alerts only) and paid tier (one-click remediation + reports). Skip: ML-based detection, SIEM log aggregation, anything beyond M365 email compromise.
Free tier (monitoring + alerts for up to 50 mailboxes) → attracts solo admins who connect their tenant. When an incident is detected, the free tier shows what happened but gates remediation actions behind the paid tier ($199/mo for up to 100 mailboxes, $499/mo for up to 500). This is 'break glass' conversion — highest urgency, highest willingness to pay. Phase 2: Add MSP/consultant tier ($99/month per tenant, unlimited tenants) to capture the IT consultant managing 10-50 SMB clients. Phase 3: Annual compliance reporting add-on ($99/mo) for cyber insurance documentation. Phase 4: Expand to Google Workspace. Target $1M ARR within 18 months.
8-12 weeks to MVP launch, 12-16 weeks to first paying customer. The free monitoring tier can start collecting tenants immediately while paid features are built out. First revenue likely comes from a Reddit/HackerNews launch driving solo admins to connect their tenants, with conversion happening when the first incident triggers the paywall. Realistically, $1K MRR within 4-5 months, $10K MRR within 8-10 months if you nail the r/sysadmin and MSP community marketing.
- “No team to call on, no senior engineer to escalate to — just me, Google, and a lot of Microsoft docs”
- “Used powershell to mass purge the emails from all internal users inbox”
- “Used Microsoft Purview Content Search to run a tenant-wide search — Found 164 malicious messages sitting in 82 mailboxes”
- “What I'm still trying to figure out”