CISO Tribune

Vendor comparison · 2 companies

Hornetsecurity vs Mimecast

Hornetsecurity sells a suite of services for Microsoft 365 security, risk, governance, compliance and backup. Mimecast describes the problem it addresses as human risk. CISO Tribune files both under Email security and Email authentication and DMARC. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Hornetsecurity
  • Mimecast
Hornetsecurity vs Mimecast: Products, Customers and Funding Compared
HornetsecurityHornetsecurity sells a suite of services for Microsoft 365 security, risk, governance, compliance and backup.hornetsecurity.comMimecastMimecast describes the problem it addresses as human risk.mimecast.com
What it sells
  • 365 Total Protection[3][4][7]A suite for Microsoft 365 security, risk, governance, compliance and backup.
  • 365 Total Backup[3][4][6]Automated Microsoft 365 data backup, recovery and protection.
  • Advanced Threat Protection[3][4][7][14]AI-powered protection of emails and data.
  • DMARC Manager[3][4][15]Safeguards domains against email impersonation, phishing and spoofing with DMARC, DKIM and SPF management.
  • Managed Threat Response[8]24x7 analyst response to every user-reported email.
Categories
Headquarters
Not stated on its pagesLondon, United Kingdom[1]
Founded
Not stated on its pages2003[1][6]
Ownership and funding
Owned by Proofpoint, Inc. since 2025[2]Owned by Permira since 2022[3][4][8][13][14][19]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pages
  • June 25, 2026Mimecast appointed Ranjan Singh as its Chief Executive Officer.[12]
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetFrom its own pages, Mimecast sells mainly to organizations that want to reduce risk caused by human actions across email, chat and file-sharing. Its pages say its plans are designed for businesses of all sizes, and its customer stories cover both small and medium businesses and enterprises. Mimecast says Incydr offers FedRAMP-authorized solutions suited to government agencies and contractors. It describes Cloud Archive as helping IT, Legal, Compliance and HR teams respond to legal inquiries or compliance audits. Its pages also point to security teams that handle user-reported email and insider risk.
Last verified
November 4, 2026September 27, 2026

Where they overlap

  • Email security is the primary category of both Hornetsecurity and Mimecast; both are also filed under Email authentication and DMARC.

Where they differ, field by field

  • Hornetsecurity is also filed under Security awareness training and Backup and cyber recovery. Mimecast is also filed under Collaboration app security and Insider risk management.
  • Hornetsecurity lists 365 Total Protection, 365 Total Backup, Advanced Threat Protection and DMARC Manager. Mimecast lists Managed Threat Response.
  • Mimecast is headquartered in London, United Kingdom.
  • Mimecast was founded in 2003.
  • Hornetsecurity is owned by Proofpoint, Inc., since 2025. Mimecast is owned by Permira, since 2022.

How they differ

CISO Tribune files Hornetsecurity under Email security, Security awareness training, Email authentication and DMARC, and Backup and cyber recovery, with Email security as its primary category. CISO Tribune files Mimecast under Email security, Email authentication and DMARC, Collaboration app security, and Insider risk management, also with Email security as its primary category. Both companies therefore sell email security and DMARC-related products, such as Hornetsecurity's DMARC Manager.

Hornetsecurity sells 365 Total Protection, a suite for Microsoft 365 security, risk, governance, compliance and backup, along with 365 Total Backup and Advanced Threat Protection. It also sells a backup and replication solution for Microsoft Hyper-V, Proxmox and VMware virtual machines. Mimecast sells Managed Threat Response, in which analysts investigate, classify and remediate each email that users report. Its Incydr product handles insider risk, and its Engage product delivers behavior-driven interventions, with nudges via email, Slack or Teams. Mimecast also offers Cloud Archive for collecting, discovering, preserving and reviewing collaboration data.

Mimecast is headquartered in London, United Kingdom, was founded in 2003, and has been owned by Permira since 2022. Hornetsecurity has been owned by Proofpoint, Inc. since 2025. Hornetsecurity states that over 12,000 partners serve more than 125,000 customers around the globe, while Mimecast says it protects and supports 42,000+ organizations globally. On June 25, 2026, Mimecast appointed Ranjan Singh as its Chief Executive Officer.

What it sells: Hornetsecurity

What 365 Total Protection does[3][4][7]
365 Total Protection plans can be onboarded in Hybrid mode. Hornetsecurity offers one package that combines email security, backup, security awareness, access and permission control and domain fraud protection.
What 365 Total Backup does[3][4][6]
The backup and recovery solution covers mailboxes and In-Place Archive mailboxes, Teams, Planner, OneNote, Entra ID Users and Groups, OneDrive for Business accounts, and SharePoint document libraries. It includes unlimited backup storage and restoration and a 4-eye-approval process.
What Advanced Threat Protection does[3][4][7][14]
Hornetsecurity's Sandbox Engine scans email attachments for potential malware by running the file in a virtual, isolated test environment. Hornetsecurity's QR Code Analyzer detects QR codes embedded directly into an email or an image. Real Time Alerts notify an IT security team about acute attacks on the company in real time.
What DMARC Manager does[3][4][15]
DMARC Manager can capture all reports sent by recipient servers back to the sender and aggregate them into a single report. Hornetsecurity describes real-time data on email messages that fail DMARC checks.

What it sells: Mimecast

What Managed Threat Response does[8]
Mimecast Managed Threat Response has analysts investigate, classify and remediate each email users report. It works with the existing report button.

Questions about Hornetsecurity and Mimecast

What do Hornetsecurity and Mimecast sell?
Hornetsecurity sells 365 Total Protection, 365 Total Backup, Advanced Threat Protection and DMARC Manager. Mimecast sells Managed Threat Response.
Are Hornetsecurity and Mimecast in the same category?
Yes. Email security is the primary category of both on CISO Tribune.
Where are Hornetsecurity and Mimecast headquartered?
Mimecast is headquartered in London, United Kingdom.
When were Hornetsecurity and Mimecast founded?
Mimecast was founded in 2003.
Who owns Hornetsecurity and Mimecast?
Hornetsecurity is owned by Proofpoint, Inc., since 2025. Mimecast is owned by Permira, since 2022.
Who are Hornetsecurity and Mimecast sold to?
From its own pages, Mimecast sells mainly to organizations that want to reduce risk caused by human actions across email, chat and file-sharing.
What have Hornetsecurity and Mimecast announced recently?
June 25, 2026: Mimecast appointed Ranjan Singh as its Chief Executive Officer.

About Hornetsecurity

Hornetsecurity sells a suite of services for Microsoft 365 security, risk, governance, compliance and backup. Hornetsecurity has been operating for 15 years. Hornetsecurity has a team of over 750 specialists. Hornetsecurity states that over 12,000 partners serve more than 125,000 customers around the globe. 365 Total Backup was formerly known as Altaro Office 365 Backup, and VM Backup was formerly known as Altaro VM Backup.[3][4][5][6]

365 Total Protection plans can be onboarded in Hybrid mode. Hornetsecurity offers one package that combines email security, backup, security awareness, access and permission control and domain fraud protection. Hornetsecurity's email security features include Spam, Malware and Phishing Filter, Advanced Threat Protection, Sandboxing, URL Rewriting, Quishing and Business Email compromise detection, AutoRemediate, Email Threat Response and Email Encryption. Hornetsecurity offers Email Archiving and Signatures and Disclaimers for managing email-related compliance and legal requirements.[1][3][4][7]

Hornetsecurity's backup and recovery solution for Microsoft 365 covers mailboxes and In-Place Archive mailboxes, Teams, Planner, OneNote, Entra ID Users and Groups, OneDrive for Business accounts, and SharePoint document libraries. The backup solution includes unlimited backup storage and restoration and a 4-eye-approval process. Hornetsecurity offers 12 regional data centers for storing data, independent of Microsoft's infrastructure.[4][7]

Hornetsecurity sells data leak prevention with permission management for Teams, OneDrive and SharePoint. Hornetsecurity offers a Governance, Risk, and Compliance (GRC) service for maintaining a compliant SharePoint, Teams and OneDrive data infrastructure and preventing users from sharing sensitive information. When a user shares a site or a file against the organization's compliance policy, site owners receive immediate notification about the violation. If a violation has not been removed by the site owner or admin, it is removed automatically based on the policy settings. Hornetsecurity's user profiling awareness engine detects the level of users, sends out automated attack simulations and creates awareness trainings based on the user's needs. Hornetsecurity lets customers set up and manage DMARC, DKIM and SPF policies for multiple domains through a single centralized platform. Hornetsecurity's suite can warn users whenever malicious links are shared through Teams chats, and it can delete entire conversations containing malicious messages.[4][7][8]

Teams Protection protects a tenant from internal compromised accounts by scanning all messages containing URLs and issuing a warning message in the conversation through the AI Cyber Assistant bot. Email Security Analyst automates responses to user queries about potential threats, replacing traditional manual analysis. AI Recipient Validation uses machine learning to analyse emails based on a user's previous communications and triggers warnings in several instances. AI Recipient Validation is available for Microsoft 365 users on the latest versions of their Outlook Mail Client for Windows, Mac and Web. AI Recipient Validation analyses email texts and attachments in the local Outlook client, and they are not transmitted to Hornetsecurity's servers. The AI Recipient Validation dashboard gives administrators an overview of the warning instances that users are exposed to and the user actions after being notified.[9][10]

Secure Links replaces the original link in an email with a rewritten version that goes through Hornetsecurity's secure web gateway. Hornetsecurity's Sandbox Engine scans email attachments for potential malware by running the file in a virtual, isolated test environment. Hornetsecurity's QR Code Analyzer detects QR codes embedded directly into an email or an image. Hornetsecurity's spam filtering service includes policy-based attachment filtering with nested archive inspection. Hornetsecurity services such as Email Encryption, Email Archive or the Continuity Service can be added with one mouse click. If a customer's mail server is unavailable, Hornetsecurity stores incoming emails for up to 7 days. Hornetsecurity sells an email archiving service for M365 and other email servers.[4][11][12][13]

Hornet.email is a hosted email service with features for collaborative work such as calendar, address book and tasks. The Hornet.email Starter Package consists of the Hornet.email email platform and the automatically integrated Spam Filter and Malware Protection. The Hornet.email Enterprise Package combines Advanced Threat Protection, Email Encryption and Email Archiving Services on a collaborative email platform. Hornet.email provides a mailbox for external and internal associates within an existing M365 license agreement. Hornetsecurity sells a backup and replication solution for Microsoft Hyper-V, Proxmox and VMware virtual machines. VM Backup can be bought as a perpetual license with a renewable Software Maintenance Agreement or as an annual subscription.[4][6][14]

Hornetsecurity states that its Partner Program applies no matter a partner's business model or team size. Hornetsecurity has an ebook for MSPs, written by a former MSP.[3][4][5][6][8][9][10][11][14][15]

Hornetsecurity on the record

Sources

Hornetsecurity full record

  1. [1]hornetsecurity.comHornetsecurity · hornetsecurity.com · undated page, accessed November 4, 2026 · Tier A
  2. [2]Proofpoint acquisition completed press releaseHornetsecurity · hornetsecurity.com · published December 8, 2025 · Tier A
  3. [3]hornetsecurity.comHornetsecurity · hornetsecurity.com · undated page, accessed November 4, 2026 · Tier A
  4. [4]Cybersecurity Services for Microsoft 365 | HornetsecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  5. [5]Hornetsecurity – Next-Gen Microsoft 365 SecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  6. [6]Backup Service Renewal | Hornetsecurity (formerly Altaro)Hornetsecurity · undated page, accessed November 10, 2026 · Tier A
  7. [7]365 Total Protection | Next-Gen Microsoft 365 Security SuiteHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  8. [8]365 Permission Manager for Microsoft 365 | HornetsecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  9. [9]AI Cyber Assistant by Hornetsecurity: Meet AI.MYHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  10. [10]AI Recipient Validation: Prevent Misdirected Emails | HornetsecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  11. [11]Advanced Threat Protection for Email | AI-powered Threat DefenseHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  12. [12]Spam Filter & Malware Protection | HornetsecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  13. [13]Business Email Continuity Service | HornetsecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  14. [14]Hosted Business Email | Hornet.emailHornetsecurity · undated page, accessed November 10, 2026 · Tier A
  15. [15]DMARC Manager - Secure Your Domain with HornetsecurityHornetsecurity · undated page, accessed November 10, 2026 · Tier A

Mimecast full record

  1. [1]CompanyMimecast · mimecast.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]ProductsMimecast · mimecast.com · undated page, accessed September 27, 2026 · Tier A
  3. [3]Permira completes acquisition of mimecastPermira · permira.com · published May 17, 2022 · Tier A
  4. [4]Human Risk Management & Advanced Email Security | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  5. [5]Advanced Email Security | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  6. [6]Mimecast Incydr | See & Stop Data Loss From Insiders | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  7. [7]Security Awareness Training | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  8. [8]Email Incident Response Service | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  9. [9]Email Archive | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  10. [10]Aware | Keep Collaboration Secure & Compliant | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  11. [11]Cybersecurity Products and Services | MimecastMimecast · undated page, accessed October 26, 2026 · Tier A
  12. [12]Mimecast Appoints Ranjan Singh as Chief Executive OfficerGlobeNewswire · published June 25, 2026 · Tier A
  13. [13]Mimecast Advanced Email Security Reviews & Product Details - G2G2 · undated page, accessed October 26, 2026 · Tier C
  14. [14]Mimecast Reviews, Ratings & Features 2026 | Gartner Peer InsightsGartner Peer Insights · undated page, accessed October 26, 2026 · Tier C
  15. [15]Cyber Security Solutions | MimecastMimecast · undated page, accessed November 4, 2026 · Tier A
  16. [16]Email & Collaboration Threat Protection | MimecastMimecast · undated page, accessed November 4, 2026 · Tier A
  17. [17]Collaboration Threat Protection | MimecastMimecast · undated page, accessed November 4, 2026 · Tier A
  18. [18]Mimecast Plans | MimecastMimecast · undated page, accessed November 4, 2026 · Tier A
  19. [19]Mimecast Reviews, Ratings & Features 2026 | Gartner Peer InsightsGartner Peer Insights · undated page, accessed November 4, 2026 · Tier C

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