What Claude (Anthropic) with web search answered for email security gateways (remote teams) on 2026-09-18

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-18

Coverage: Claude (Anthropic) with web search. Other engines not included.

The question asked, verbatim: best email security gateways for remote teams

Brands named, in the order the engine gave

1. Microsoft 365 mentioned
   Your mail already lives in Microsoft 365 or Google Workspace, your people are on laptops in coffee shops, and the threats that actually get through are payloadless - BEC, vendor invoice fraud, account takeover.
2. Google Workspace mentioned
   Your mail already lives in Microsoft 365 or Google Workspace, your people are on laptops in coffee shops, and the threats that actually get through are payloadless - BEC, vendor invoice fraud, account takeover.
3. Sublime mentioned
   Sublime Security - My default pick for most remote teams.
4. Abnormal mentioned
   Abnormal AI - The one to buy if BEC and account takeover are your real worry.
5. Abnormal AI mentioned
   Abnormal AI - The one to buy if BEC and account takeover are your real worry.
6. Check mentioned
   Check Point Harmony Email & Collaboration (formerly Avanan) - Good middle ground.
7. Slack mentioned
   API-based, but also covers Teams, Slack and OneDrive, which matters when a distributed team does most of its real talking outside email.
8. Microsoft Defender mentioned
   Microsoft Defender for Office 365 (Plan 1/2) - Worth naming because if you're on Business Premium or E5 you already own it.
9. Defender mentioned
   Microsoft Defender for Office 365 (Plan 1/2) - Worth naming because if you're on Business Premium or E5 you already own it.
10. Mimecast mentioned
    Mimecast - The gateway I'd pick if you want one vendor for everything.
11. Proofpoint mentioned
    Proofpoint - The heavyweight.
12. IRONSCALES mentioned
    IRONSCALES - Honorable mention for small teams without a security person.
13. UnderDefense mentioned
    - Abnormal Security Pricing Guide 2026 - UnderDefense (https://underdefense.com/blog/abnormal-security-pricing-guide/)

Sources the engine cited

The answer, as recorded

## Short version first For a remote team, the classic MX-record "gateway" is usually the wrong shape. Your mail already lives in Microsoft 365 or Google Workspace, your people are on laptops in coffee shops, and the threats that actually get through are payloadless - BEC, vendor invoice fraud, account takeover. API-based tools (which sit behind the mailbox rather than in front of it) deploy in an afternoon, don't break mail flow, and can claw back a message *after* delivery when it turns bad. That's the category I'd point you at first. ## What I'd actually recommend, in order **1. Sublime Security** - My default pick for most remote teams. API-deployed for M365/Workspace, no MX change, and detections are written as readable rules you can inspect and tune yourself rather than a black-box score. Roughly $1.50-$3/user/month, meaningfully under SEG pricing, and there's a free tier for small orgs. Best combination of transparency and cost. **2. Abnormal AI** - The one to buy if BEC and account takeover are your real worry. It behaviorally baselines every sender, internal and external, and catches the no-link, no-attachment "hey can you wire this today" mail that signature-based tools structurally miss. Costs more and the detection logic is opaque, but it's the strongest in its lane. **3. Check Point Harmony Email & Collaboration (formerly Avanan)** - Good middle ground. API-based, but also covers Teams, Slack and OneDrive, which matters when a distributed team does most of its real talking outside email. Sensible if you already own Check Point elsewhere. **4. Microsoft Defender for Office 365 (Plan 1/2)** - Worth naming because if you're on Business Premium or E5 you already own it. Safe Links and Safe Attachments plus tuned anti-phishing policies is a real baseline, and for a small team with tight budget it may be enough on its own. Its known weak spot is BEC, which is exactly what #1 or #2 layers on top of. **5. Mimecast** - The gateway I'd pick if you want one vendor for everything. Its distinguishing feature is email continuity: it runs parallel infrastructure, so when M365 has an outage your team keeps sending and receiving. For a remote team with no office IT to lean on, that's a genuinely underrated benefit. Bundles archiving and security awareness training too. **6. Proofpoint** - The heavyweight. Deepest threat intel and URL/attachment sandboxing, strongest choice if you're in a regulated industry or getting genuinely targeted. It's heavier to administer than a 30-person company can usually justify, so I'd only put it first if compliance requirements push you there. **7. IRONSCALES** - Honorable mention for small teams without a security person. Its user-reporting loop and built-in phishing simulation training are well-suited to the "everyone is remote and nobody is watching a SOC dashboard" situation. ## If you want one sentence Turn on Defender/Workspace native controls properly, then put **Sublime** on top - and swap Sublime for **Abnormal** if wire fraud is the thing that would actually hurt you. Sources: - [Best Secure Email Gateway (SEG) solutions 2026 - PeerSpot](https://www.peerspot.com/categories/secure-email-gateway-seg) - [Proofpoint vs Mimecast vs Abnormal Security: Comparison Guide for IT Leaders (2026)](https://technologymatch.com/blog/proofpoint-vs-mimecast-vs-abnormal-security-email-security-comparison) - [Sublime Security - Plans](https://sublime.security/plans/) - [Sublime Security - Top 12 Email Security Companies](https://sublime.security/articles/top-email-security-companies/) - [Best Email Security Solutions: Companies, Software & Reviews (2026) - IRONSCALES](https://ironscales.com/blog/the-best-email-security-companies-rankings-and-reviews) - [Avanan Office 365 Email Security - Microsoft Marketplace](https://marketplace.microsoft.com/en-us/product/saas/avananinc1617197924285.avanan?tab=overview) - [Email Security Solutions: 12 Tools Compared - Flamingo](https://www.flamingo.run/blog/email-security-solutions) - [Abnormal Security Pricing Guide 2026 - UnderDefense](https://underdefense.com/blog/abnormal-security-pricing-guide/)

Markdown edition · the question page, with every recording · Answer Watch · AEO Watch

Answer Watch records what one AI answer engine said on one date, nothing more. Each page names the engine and the model, carries the date the question was asked, and lists the brands that appeared in the answer in the order the engine gave them, with the sources it cited. It is a measurement, not a ranking, not a recommendation and not a claim about the world. Brands that did not appear in an answer are not named on any public page. Coverage: Claude (Anthropic) with web search. Other engines not included.