# Email security for small business buyers: what AI models recommend, September 2026

IT AI Recommendation Index, September 2026 Edition. Asked as "email security platform" and as "phishing and email threat protection tool", six framings each, to twelve models with search on, on behalf of a small B2B company. Page: https://it-ai-index.com/security/email-security/smb/

**Standing:** Microsoft Defender for Office 365 leads with 44% of first choices; verdict clear leader. 52 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| # | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | Microsoft Defender for Office 365 | 44% | 7% | 58 |
| 2 | IRONSCALES | 19% | 0% | 35 |
| 3 | Proofpoint Email Protection | 6% | 24% | 54 |
| 4 | Barracuda Email Protection | 6% | 11% | 27 |
| 5 | Abnormal AI | 6% | 0% | 20 |
| 6 | Check Point Harmony Email & Collaboration | 6% | 8% | 25 |
| 7 | SpamTitan | 2% | 10% | 20 |
| 8 | Coro | 2% | 13% | 15 |
| 9 | Guardz | 0% | 0% | 12 |
| 10 | Mimecast Email Security | 0% | 45% | 31 |

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: no first choice
- GPT-5.4 mini: Microsoft Defender for Office 365; alternatives Barracuda Email Protection, IRONSCALES, Mimecast Email Security, Proofpoint Email Protection
- Gemini 3.5 Flash: Check Point Harmony Email & Collaboration; alternatives Coro, IRONSCALES
- Perplexity Sonar: IRONSCALES; alternatives Guardz, Microsoft Defender for Office 365
- Grok 4.1 Fast: IRONSCALES, Microsoft Defender for Office 365; alternatives Proofpoint Email Protection, SpamTitan
- Mistral Small: IRONSCALES, Microsoft Defender for Office 365; alternatives Proofpoint Email Protection, SpamTitan
- DeepSeek V4 Flash: IRONSCALES, Microsoft Defender for Office 365; alternatives Abnormal AI, Barracuda Email Protection, Proofpoint Email Protection
- Llama 4 Maverick: IRONSCALES; alternatives Coro, Microsoft Defender for Office 365, Proofpoint Email Protection
- Qwen 3.7 Flash: Barracuda Email Security Service, Microsoft Defender for Office 365; alternatives Google Workspace
- Kimi K2: Microsoft Defender for Office 365; alternatives Check Point Harmony Email & Collaboration, Proofpoint Email Protection, SpamTitan
- GLM 4.7 FlashX: Microsoft Defender for Office 365; alternatives Mimecast Email Security, Proofpoint Email Protection
- MiniMax M2.5: Microsoft Defender for Office 365; alternatives Coro, Proofpoint Email Protection, SpamTitan

## Sources the answers cite

63 of 72 answers came back with a source list, from 12 of 12 models. Sites named in the most answers:

- simplyit.biz: 41 answers, 41 citations
- gartner.com: 38 answers, 42 citations
- esecurityplanet.com: 29 answers, 29 citations
- consilien.com: 28 answers, 30 citations
- learn.g2.com: 26 answers, 26 citations
- expertinsights.com: 24 answers, 31 citations
- ittoolsguide.com: 24 answers, 24 citations
- ironscales.com: 20 answers, 28 citations

Pages named in the most answers:

- https://simplyit.biz/resources/email-security-platforms-small-business-2026 (41 answers)
- https://gartner.com/reviews/market/email-security (37 answers)
- https://esecurityplanet.com/products/best-email-security-software (29 answers)
- https://consilien.com/news/best-email-security-solutions-small-business-2026 (28 answers)
- https://learn.g2.com/best-cloud-email-security-platforms (26 answers)
- https://ittoolsguide.com/email-security-software-for-small-business (24 answers)
- https://ironscales.com/blog/the-best-email-security-companies-rankings-and-reviews (19 answers)
- https://trustcyberhub.com/best-email-security-solutions-for-smbs-in-2026-full-comparison (17 answers)
- https://expertinsights.com/email-security/top-email-security-gateways (16 answers)
- https://lockyourbiz.com/tool-reviews/email-security (12 answers)

## Warned against

- Mimecast Email Security: 14 of 31 labels negative. "Customer satisfaction has declined in recent years, with many reviewers reporting an increase in missed attacks and expressing frustration with the overly complex setup and administration." (Claude Haiku 4.5, negative prompt)
- Proofpoint Email Protection: 13 of 54 labels negative. "the best approach is to avoid traditional, expensive Secure Email Gateways (SEGs) like Mimecast or Proofpoint Enterprise" (Gemini 3.5 Flash, budget prompt)
- Barracuda Email Protection: 3 of 27 labels negative. "older on-prem Barracuda models ... Why to avoid" (Gemini 3.5 Flash, negative prompt)
- Cisco Secure Email: 3 of 5 labels negative. "Legacy, On-Premises Hardware Appliances (Avoid Completely)" (Gemini 3.5 Flash, negative prompt)

## Record

- Method: https://it-ai-index.com/methodology/
- Raw judge labels and full responses: https://it-ai-index.com/data/
- License: CC BY 4.0. Cite as IT AI Recommendation Index, September 2026 Edition, it-ai-index.com.