{"question": "best email security gateways for small businesses", "category": "email-security-gateways", "category_name": "email security gateways", "audience": "small-businesses", "audience_name": "small businesses", "engine": "Claude (Anthropic) with web search", "model": "claude-opus-5", "asked_at": "2026-10-07T22:21:23Z", "permalink": "https://bikoosh.com/answers/s/email-security-gateways-small-businesses-2026-10-07", "question_page": "https://bikoosh.com/answers/q/email-security-gateways/small-businesses", "brands_named": [{"position": 1, "brand": "Microsoft", "label": "mentioned"}, {"position": 2, "brand": "Microsoft 365", "label": "mentioned"}, {"position": 3, "brand": "Google", "label": "mentioned"}, {"position": 4, "brand": "Google Workspace", "label": "mentioned"}, {"position": 5, "brand": "Microsoft Defender", "label": "mentioned"}, {"position": 6, "brand": "Defender", "label": "mentioned"}, {"position": 7, "brand": "Plan 1", "label": "mentioned"}, {"position": 8, "brand": "Microsoft 365 Business", "label": "mentioned"}, {"position": 9, "brand": "Microsoft 365 Business Premium", "label": "mentioned"}, {"position": 10, "brand": "Abnormal", "label": "mentioned"}, {"position": 11, "brand": "IRONSCALES", "label": "recommended"}, {"position": 12, "brand": "KnowBe4", "label": "mentioned"}, {"position": 13, "brand": "Proofpoint Essentials", "label": "mentioned"}, {"position": 14, "brand": "Mimecast", "label": "mentioned"}, {"position": 15, "brand": "Check", "label": "mentioned"}, {"position": 16, "brand": "Avanan", "label": "mentioned"}, {"position": 17, "brand": "Slack", "label": "mentioned"}, {"position": 18, "brand": "Guardz", "label": "mentioned"}, {"position": 19, "brand": "Defender P1", "label": "mentioned"}], "sources_cited": [{"url": "https://www.microsoft.com/en-us/security/business/siem-and-xdr/microsoft-defender-office-365", "domain": "microsoft.com", "source_type": "vendor"}, {"url": "https://costbench.com/best/email-security-small-business", "domain": "costbench.com", "source_type": "other"}, {"url": "https://www.esecurityplanet.com/products/best-email-security-software/", "domain": "esecurityplanet.com", "source_type": "other"}, {"url": "https://www.g2.com/categories/secure-email-gateway/small-business", "domain": "g2.com", "source_type": "review"}, {"url": "https://g2.com/products/proofpoint-essentials-for-small-business/pricing", "domain": "g2.com", "source_type": "review"}, {"url": "https://costbench.com/compare/barracuda-email-protection-vs-proofpoint/", "domain": "costbench.com", "source_type": "other"}, {"url": "https://www.trustradius.com/compare-products/mimecast-email-security-cloud-integrated-vs-proofpoint-essentials-for-small-business", "domain": "trustradius.com", "source_type": "review"}, {"url": "https://tr-web.dev.trustradius.com/compare-products/avanan-vs-barracuda-email-protection", "domain": "tr-web.dev.trustradius.com", "source_type": "review"}, {"url": "https://www.costbench.com/best/best-email-security-for-smb/", "domain": "costbench.com", "source_type": "other"}], "answer_text": "## The short version first\n\nThe \"gateway\" category has largely been replaced for small businesses. A classic secure email gateway (SEG) sits in front of your mail by changing your MX record - that was the right design when you ran your own Exchange server. If you're on Microsoft 365 or Google Workspace (almost everyone is now), the better architecture is an **API-based layer that sits behind** the native filter instead of in front of it. It deploys in an afternoon, can't break mail delivery if it goes down, and sees internal email too - which matters because the attacks that actually hurt small businesses are account takeover and invoice fraud from a *compromised real account*, which a perimeter gateway never sees.\n\nSo I'll name both kinds, in the order I'd actually consider them.\n\n**1. Microsoft Defender for Office 365 Plan 1** - Start here, and genuinely consider stopping here. If you're on Microsoft 365 Business Premium, you already own it. It gives you Safe Links, Safe Attachments, and anti-phishing with no new vendor, no new bill, and no new integration to break. A lot of small businesses buy a third-party tool while leaving this unconfigured, which is the worst of both worlds", "answer_truncated": true, "measurement": "One answer from one engine on one date. Not a ranking and not a claim about the world; brands the engine did not name are not recorded.", "limitation": "Coverage: Claude (Anthropic) with web search. Other engines not included.", "alerts": {"name": "Answer Watch Pro", "price_usd": 79, "period": "month", "gets": "daily change alerts for up to 5 brands in what one AI answer engine says, history, CSV export. Coverage: Claude (Anthropic) with web search. Other engines not included", "url": "https://bikoosh.com/answers"}}