If your organisation runs Microsoft 365 Business Premium, you already have Microsoft Defender for Office 365 Plan 1 included in your licence. So the natural question when evaluating Barracuda Email Protection is: do I actually need both?
The honest answer is: it depends on your threat profile and how well Defender is configured. But for most Indian SMBs, Barracuda adds meaningful protection that Defender alone does not provide — specifically around AI-powered BEC detection, account takeover, lateral phishing, automated incident response, and security awareness training.
This guide compares Barracuda Email Protection and Microsoft Defender for Office 365 across every relevant dimension to help you make the right decision.
What is Microsoft Defender for Office 365?
Microsoft Defender for Office 365 is Microsoft's native email security layer that sits on top of Exchange Online Protection (EOP). It comes in two plans:
Plan 1 — Included in Microsoft 365 Business Premium (~₹1,500/user/month)
- Safe Links — rewrites URLs; re-scans at click time
- Safe Attachments — detonates suspicious attachments in a sandbox before delivery
- Anti-phishing policies — impersonation protection for configured users and domains; spoof intelligence; mailbox intelligence
- Real-time detections — basic threat view in the Security portal
Plan 2 — Included in Microsoft 365 E3/E5
- Everything in Plan 1
- Threat Explorer — real-time email investigation
- Campaign views — coordinated attack detection
- Attack Simulation Training — built-in phishing simulation
- Automated investigation and response (AIR)
- Advanced hunting (KQL queries)
Important caveat: Defender for Office 365 Plan 1 capabilities only provide meaningful protection when properly configured with anti-phishing policies, Safe Links enabled for all users, Safe Attachments active (not just monitor mode), and MFA enforced. Most Indian businesses on Business Premium have not completed this configuration.
What is Barracuda Email Protection?
Barracuda Email Protection is an API-native email security platform that connects to Microsoft 365 via Microsoft Graph API — no MX record change required. It deploys in hours and adds a dedicated AI security layer on top of whatever Microsoft provides.
Barracuda comes in three tiers:
| Tier | Key capabilities |
|---|---|
| Essentials | Anti-spam, anti-phishing, anti-malware, link protection, attachment sandboxing |
| Advanced | Everything in Essentials + AI-powered impersonation detection, account takeover protection, forensic analysis, automated incident response |
| Premium Plus | Everything in Advanced + Security Awareness Training (phishing simulations + training), DMARC reporting, email encryption |
Head-to-Head Comparison
| Capability | Microsoft Defender Plan 1 | Barracuda Email Protection |
|---|---|---|
| Attachment sandboxing | ✅ Safe Attachments | ✅ Barracuda ATP Sandboxing |
| URL rewriting (time-of-click) | ✅ Safe Links | ✅ Link protection |
| Anti-spam / connection filtering | ✅ EOP (underlying) | ✅ Additional layer |
| Impersonation protection (policy-based) | ✅ (configured users only) | ✅ ML model — all users |
| AI-powered BEC detection | ⚠️ Partial (policy-based) | ✅ Dedicated ML model |
| Account takeover protection | ❌ Not included | ✅ Behavioural analysis + auto-remediation |
| Lateral phishing detection | ❌ Not included | ✅ API access to internal mail flow |
| Automated incident response | ❌ Not in Plan 1 | ✅ One-click + automated email removal |
| Post-delivery email removal | ❌ Not in Plan 1 | ✅ Remove from all inboxes after threat identified |
| Security awareness training | ❌ Not in Plan 1 | ✅ Premium Plus tier |
| DMARC reporting | ❌ Not included | ✅ Premium Plus tier |
| Email continuity | ❌ Not included | ❌ Not included |
| 99-year archiving | ❌ Not included | ❌ Not included |
| Deployment complexity | Medium (policy config required) | Low (API consent + connect) |
| MX record change | No | No |
| Works for Google Workspace | No | ✅ Yes |
Where Defender Falls Short
1. BEC Detection Is Policy-Based, Not AI-Powered
Defender for Office 365 Plan 1 anti-phishing policies protect specific users and domains you explicitly configure. You tell it: protect the CEO, protect the CFO, protect finance@company.com, and flag lookalike domains.
The problem: attackers don't only target the people you configured. A BEC attack targeting your procurement manager, your accounts payable coordinator, or a mid-level employee with financial system access bypasses protection policies if those users aren't explicitly listed.
Barracuda's AI models are trained on over 50 billion emails and analyse communication patterns across your entire organisation — not just configured users. They learn the normal communication patterns between your users and flag anomalies: a vendor suddenly sending from a different domain, an executive suddenly requesting a wire transfer, a new correspondent asking for unusual actions.
2. No Account Takeover Protection
Account takeover (ATO) is one of the most dangerous email threats facing Indian businesses. The attack chain:
- Employee clicks phishing link → enters M365 credentials on a fake login page
- Attacker now has valid username and password
- Attacker logs in, accesses email, sets up forwarding rules, reads sensitive conversations
- Uses the legitimate account to send BEC emails to colleagues and clients ("Hi, this is Rajesh from accounts — please transfer the invoice payment to this new account")
Microsoft Defender for Office 365 Plan 1 has no account takeover detection. It handles email threats but cannot monitor for compromised account behaviour (unusual login locations, anomalous sending patterns, new forwarding rules being created).
Barracuda's ATO protection monitors login behaviour, sending patterns, and mailbox rule changes in real time. When it detects a compromised account, it alerts IT and can automatically suspend the account and remove emails sent from it.
3. No Lateral Phishing Detection
Lateral phishing — where a compromised internal account is used to phish colleagues — bypasses virtually every email security control that filters inbound email, because the email is not inbound: it comes from inside your own domain.
Microsoft Defender Plan 1 processes external inbound email. An email from colleague@yourcompany.com to otherperson@yourcompany.com doesn't pass through the same scanning path as external email.
Because Barracuda connects via API and has access to your mailbox data, it can monitor internal email flow and detect when a legitimate account suddenly starts sending unusual messages to colleagues — a strong indicator of account compromise being used for lateral phishing.
4. No Automated Incident Response in Plan 1
When a malicious email bypasses Defender (and some always will), remediating it manually is time-consuming. An IT administrator has to: identify the email, find all recipients, access each mailbox, and delete the message. At scale — when a phishing campaign delivers to 200 recipients — this can take hours.
Barracuda's post-delivery remediation removes a malicious email from every inbox in the organisation with one click (or automatically, based on threat classification). Response time goes from hours to seconds.
Where Defender is Strong
Safe Links and Safe Attachments Are Genuinely Effective
When configured correctly, Safe Attachments (sandbox detonation before delivery) and Safe Links (time-of-click URL rewriting) are effective controls. Safe Attachments stops zero-day malware that hasn't been seen before. Safe Links catches URLs that go live after the email is delivered.
The caveat "when configured correctly" is important. Default configuration in Business Premium has Safe Attachments in monitor mode (not blocking), and Safe Links policies are not automatically applied to all users. These need to be explicitly configured.
Tight Microsoft Ecosystem Integration
Defender signals feed into Microsoft Sentinel, Microsoft 365 Defender XDR, Conditional Access, and the broader Microsoft security stack. If your IT team works primarily in the Microsoft security portal, Defender's native integration is easier to manage than a separate console.
Plan 2 Is Substantially More Capable
Microsoft Defender for Office 365 Plan 2 (E3/E5) includes automated investigation and response (AIR), Attack Simulation Training, Threat Explorer, and advanced hunting. If you're on an enterprise Microsoft licence, Plan 2 closes several of the gaps listed above. The comparison gets much closer at Plan 2 vs Barracuda.
When to Use Barracuda Alongside Defender
Add Barracuda Email Protection (Advanced or Premium Plus) if:
- You're on Microsoft 365 Business Standard or Basic (no Defender at all) — Barracuda provides the sandboxing and BEC detection that EOP alone cannot
- You're on Business Premium with Defender Plan 1 and you've experienced a BEC attempt, account compromise, or phishing campaign that bypassed Defender
- You have finance, accounts payable, or HR teams who are high-value BEC targets not in your Defender policy list
- You need account takeover protection — you're on any M365 plan and can't afford a compromised account sending internal phishing
- You want Security Awareness Training built into your email platform (Premium Plus) — avoiding a separate tool and cost
- Your IT team is small and you need automated incident response — Barracuda's one-click remediation is significantly faster than manual Defender response
Defender Plan 1 alone may be sufficient if:
- You've properly configured all Defender policies (Safe Links, Safe Attachments, anti-phishing with impersonation protection for all key users, MFA via Conditional Access)
- You have an IT team actively monitoring the Security portal
- Your threat profile is primarily commodity phishing (mass campaigns) rather than targeted BEC
- You're evaluating Defender Plan 2 (E5) which closes most of the gaps
The Dual-Layer Architecture (Common Enterprise Configuration)
Many enterprise Microsoft 365 deployments in India run both:
Barracuda Email Protection (API-native) + Microsoft Defender for Office 365 Plan 1
In this configuration:
- Defender handles Safe Links and Safe Attachments at the Microsoft layer
- Barracuda adds AI BEC detection, ATO protection, lateral phishing monitoring, and incident response via API
- Neither causes delivery loops (Barracuda is API-inline, not an MX gateway)
- Each catches different threat categories with different detection models
The overhead is two security consoles to monitor, but for organisations with high-value targets, the layered detection is worth the management cost.
Practical Recommendation for Indian Businesses
Microsoft 365 Business Basic or Standard (no Defender): Add Barracuda Email Protection Advanced. EOP alone has no sandboxing, no AI BEC detection, no time-of-click URL rewriting. Barracuda fills all three gaps. Deploy via API in under 2 hours.
Microsoft 365 Business Premium (Defender Plan 1 — not yet configured): Step 1: Get Defender properly configured (anti-phishing policies, Safe Attachments in block mode, Safe Links for all users, MFA). Step 2: Reassess. If BEC and ATO are concerns — add Barracuda Advanced.
Microsoft 365 Business Premium (Defender Plan 1 — fully configured) + BEC risk: Add Barracuda Email Protection Advanced specifically for: AI BEC detection across all users, account takeover monitoring, lateral phishing, and post-delivery remediation.
Microsoft 365 E3/E5 (Defender Plan 2): Defender Plan 2 closes most gaps. Evaluate Barracuda only if you need its specific ATO detection or Security Awareness Training (Premium Plus) to consolidate tools.
FAQs
Does Barracuda replace Microsoft Defender?
No — Barracuda Email Protection works alongside Defender. It connects via Microsoft Graph API and does not replace or interfere with Defender's filtering. Both run concurrently; Barracuda adds AI layers that Defender doesn't have (ATO, lateral phishing, automated remediation).
Does running both Barracuda and Defender cause mail delivery issues?
No. Because Barracuda connects via API (not as an MX gateway), email continues to flow normally through Microsoft's infrastructure. Barracuda scans delivered emails and acts post-delivery. There is no risk of mail loops or delivery gaps.
Which is better for phishing — Barracuda or Defender?
Both are effective at different phishing types. Defender's Safe Attachments and Safe Links are strong at technical payload-based phishing (malware attachments, known malicious URLs). Barracuda's AI models are better at social engineering phishing (BEC, impersonation) that has no malicious payload. Ideal protection uses both.
Does Cloudfy supply and configure Barracuda Email Protection for M365?
Yes. Cloudfy is a Barracuda Preferred Partner in India and we configure both Barracuda and Defender to work together, ensuring no policy conflicts and comprehensive coverage. Contact us for a same-day INR quote.