What Claude (Anthropic) with web search answered for email security gateways (remote teams) on 2026-09-24

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-24

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
   For a remote team on Microsoft 365 or Google Workspace, don't buy a traditional gateway.
2. Google Workspace mentioned
   For a remote team on Microsoft 365 or Google Workspace, don't buy a traditional gateway.
3. Remote mentioned
   "Remote team" means cloud mailboxes and no perimeter, and a SEG's whole model is MX-record rerouting to filter mail before delivery.
4. API-based mentioned
   The modern answer is an API-based layer that sits on the mailbox itself and catches internal/lateral phishing and account takeover - things a SEG structurally cannot see, since that mail never crosses the gateway.
5. Sublime mentioned
   (Sublime (https://sublime.security/articles/api-based-email-security-vs-traditional-seg/), Guardz (https://guardz.com/blog/api-email-security-vs-secure-email-gateway/))
6. Guardz mentioned
   (Sublime (https://sublime.security/articles/api-based-email-security-vs-traditional-seg/), Guardz (https://guardz.com/blog/api-email-security-vs-secure-email-gateway/))
7. Abnormal mentioned
   Abnormal AI (formerly Abnormal Security) - my default pick.
8. Abnormal AI mentioned
   Abnormal AI (formerly Abnormal Security) - my default pick.
9. IRONSCALES mentioned
   (PeerSpot (https://www.peerspot.com/categories/secure-email-gateway-seg), IRONSCALES roundup (https://ironscales.com/blog/the-best-email-security-companies-rankings-and-reviews))
10. Microsoft Defender mentioned
    Microsoft Defender for Office 365 (P2) - if you're on M365 E5 you already own it, so start here before spending anything.
11. Defender mentioned
    Microsoft Defender for Office 365 (P2) - if you're on M365 E5 you already own it, so start here before spending anything.
12. Material mentioned
    Material Security - the one I'd name for a remote team whose real fear is what's already sitting in the mailbox.
13. Proofpoint mentioned
    Proofpoint - name it when you're large, or when procurement/compliance demands a recognized enterprise brand.
14. Check mentioned
    Check Point Harmony Email & Collaboration (ex-Avanan) - inline-API hybrid that can block pre-delivery while still seeing internal mail.
15. Avanan mentioned
    Check Point Harmony Email & Collaboration (ex-Avanan) - inline-API hybrid that can block pre-delivery while still seeing internal mail.
16. Mimecast mentioned
    Mimecast - reach for this when you need archiving and retention as much as filtering;

Sources the engine cited

The answer, as recorded

## The short version For a remote team on Microsoft 365 or Google Workspace, **don't buy a traditional gateway.** "Remote team" means cloud mailboxes and no perimeter, and a SEG's whole model is MX-record rerouting to filter mail before delivery. The modern answer is an API-based layer that sits on the mailbox itself and catches internal/lateral phishing and account takeover - things a SEG structurally cannot see, since that mail never crosses the gateway. ([Sublime](https://sublime.security/articles/api-based-email-security-vs-traditional-seg/), [Guardz](https://guardz.com/blog/api-email-security-vs-secure-email-gateway/)) ## What I'd actually name, in order 1. **Abnormal AI (formerly Abnormal Security)** - my default pick. API-native, deploys in minutes with an admin OAuth grant, no MX change. It profiles identity and normal behavior per person, so it's the strongest option against payload-free social engineering - BEC, vendor fraud, a compromised colleague's real account. Their Attune model (March 2026) scores identity + behavior + content together. Pricing is quote-only and it leans enterprise. ([PeerSpot](https://www.peerspot.com/categories/secure-email-gateway-seg), [IRONSCALES roundup](https://ironscales.com/blog/the-best-email-security-companies-rankings-and-reviews)) 2. **Microsoft Defender for Office 365 (P2)** - if you're on M365 E5 you already own it, so start here before spending anything. Good attachment/URL detonation and solid automated investigation. It's weaker on the pure social-engineering cases, which is exactly why most teams add #1 or #3 on top rather than instead. ([Gartner-based guide](https://bcs365.com/insights/best-email-security-solutions-gartner)) 3. **Sublime Security** - pick this if you have an engineer who *wants* to own detection. Detection-as-code: you write and tune rules in their MQL, with a public rule repo and a free tier. Highest-rated of the newer entrants (4.9 on Gartner Peer Insights, 29 reviews). The flip side is it rewards hands-on tuning, so it's a poor fit if nobody has time for it. ([Gartner](https://www.gartner.com/reviews/market/email-security/compare/material-vs-sublime-security)) 4. **Material Security** - the one I'd name for a remote team whose real fear is *what's already sitting in the mailbox*. It's post-delivery: it redacts and re-auth-gates sensitive old mail, so a stolen session doesn't hand over years of archive. Broad coverage across email, files, and identity on both Workspace and M365. Strong Google Workspace story specifically. ([Material](https://material.security/compare-sublime-security)) 5. **IRONSCALES** - best fit for a small remote team with no dedicated security staff. Heavy emphasis on user-reported phishing feeding back into detection, plus built-in simulation training, which matters more than tooling when your people are scattered and can't lean over to ask a colleague "is this real?" 6. **Proofpoint** - name it when you're large, or when procurement/compliance demands a recognized enterprise brand. Best-in-class threat intel and BEC coverage, and they now sell an API-based Adaptive Email Security alongside the gateway. Heavier to run than everything above. ([PeerSpot](https://www.peerspot.com/categories/secure-email-gateway-seg), [Proofpoint on SEG vs API](https://www.proofpoint.com/us/blog/email-and-cloud-threats/secure-email-gateway-seg-vs-api-based-email-security)) 7. **Check Point Harmony Email & Collaboration (ex-Avanan)** - inline-API hybrid that can block pre-delivery while still seeing internal mail. Good value if you already run Check Point elsewhere. Quote-only pricing, aimed slightly above the smallest shops. ([SelectHub](https://www.selecthub.com/p/email-security-software/avanan/)) 8. **Guardz** - the budget/very-small-team answer: $15/user/month, transparent pricing, and it bundles the Check Point Harmony (Avanan) engine at no extra cost alongside endpoint and dark-web monitoring. Built for MSPs, so it's also the right call if an outsourced IT provider runs your stack. ([Guardz](https://guardz.com/blog/best-email-security-for-msps/), [Capterra](https://www.capterra.com/p/10011525/Guardz/)) 9. **Mimecast** - reach for this when you need archiving and retention as much as filtering; that bundle is its real differentiator, and it rated highest (8.6) among SEG leaders on PeerSpot. Still fundamentally gateway-shaped. ([PeerSpot](https://www.peerspot.com/categories/secure-email-gateway-seg)) 10. **Barracuda Email Protection** - the sensible mid-market compromise: gateway plus inbox defense at an accessible price, with decent MSP delivery. ([Kaseya](https://www.kaseya.com/blog/best-email-security-solutions/)) ## One caveat on the sources Several of the "best of 2026" lists above are published by vendors who appear in their own rankings - IRONSCALES, Check Point, Sublime, Guardz, and Kaseya all rank themselves. I used them for the product landscape, not for the ordering. The order above is mine. **If you want one sentence:** turn on Defender P2 if you already pay for it, layer **Abnormal** over it, and substitute **Guardz** if the budget is tight or **Material** if your worry is the existing archive rather than incoming mail. Sources: - [API-based email security vs traditional SEG - Sublime](https://sublime.security/articles/api-based-email-security-vs-traditional-seg/) - [API Email Security vs Secure Email Gateway - Guardz](https://guardz.com/blog/api-email-security-vs-secure-email-gateway/) - [SEG vs. API-Based Email Security - Proofpoint](https://www.proofpoint.com/us/blog/email-and-cloud-threats/secure-email-gateway-seg-vs-api-based-email-security) - [Best SEG solutions 2026 - PeerSpot](https://www.peerspot.com/categories/secure-email-gateway-seg) - [Best Email Security Companies - IRONSCALES](https://ironscales.com/blog/the-best-email-security-companies-rankings-and-reviews) - [Best Email Security Solutions per Gartner - BCS365](https://bcs365.com/insights/best-email-security-solutions-gartner) - [Material vs Sublime Security - Gartner Peer Insights](https://www.gartner.com/reviews/market/email-security/compare/material-vs-sublime-security) - [Sublime Security Alternative - Material Security](https://material.security/compare-sublime-security) - [Avanan Reviews & Pricing - SelectHub](https://www.selecthub.com/p/email-security-software/avanan/) - [Best Email Security Platforms for MSPs - Guardz](https://guardz.com/blog/best-email-security-for-msps/) - [Guardz Pricing - Capterra](https://www.capterra.com/p/10011525/Guardz/) - [Best email security solutions 2026 - Kaseya](https://www.kaseya.com/blog/best-email-security-solutions/)

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.