Comparison Guide

Mimecast vs Proofpoint

Mimecast and Proofpoint are two of the longest-running names in email security. Both use the traditional Secure Email Gateway (SEG) model that changes your MX record to route mail through their service. They differ in strengths around archiving, threat intelligence, and pricing model.

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Quick Answer

Proofpoint wins for most buyers.

Both are enterprise gateways — Mimecast for archiving-heavy needs, Proofpoint for large enterprise with TAP.

Side-by-Side Comparison

Feature Mimecast Proofpoint
Architecture Secure Email Gateway (SEG) Secure Email Gateway (SEG)
MX Record Change Required Required
Internal Email Scanning Limited (gateway-only) Limited (gateway-only)
Email Archiving Built-in, 10+ year retention Available as add-on
Email Continuity Included (7-day rolling) Enterprise Continuity add-on
Threat Intelligence Mimecast CyberGraph Proofpoint NexusAI + TAP
Threat Response Awareness + remediation TRAP (auto-pull known bad)
Training Integration Mimecast Awareness Training Proofpoint Security Awareness
Target Market Mid-market to enterprise Large enterprise
Pricing Model Per-user, tiered Per-user, enterprise sales

Our Verdict

Mimecast is the stronger choice for organizations that need email archiving, continuity, and compliance features alongside security. Proofpoint is stronger for large enterprises that value its Targeted Attack Protection (TAP), Threat Response Auto-Pull (TRAP), and mature threat intelligence. For Microsoft 365 shops without archiving needs, an API-based solution like Avanan often delivers better protection at lower cost.

Unio Digital recommends: Both are enterprise gateways — Mimecast for archiving-heavy needs, Proofpoint for large enterprise with TAP

Quick Picks

Which one should you pick?

Three buyer profiles, three answers. Pick the row that fits.

Mid-market with archiving or compliance needs

Pick: Mimecast

You need retention, e-discovery, and continuity bundled with the security layer. Mimecast's entry Critical plan includes continuity and backup, and its archive covers email plus Teams.

Get a Mimecast quote

Large enterprise (5,000+ mailboxes)

Pick: Proofpoint

Dedicated security staff, targeted attack exposure, and budget for an enterprise sales cycle. TAP-class sandboxing plus auto-pull remediation of forwarded copies justify the premium at scale.

Talk to a strategist

Procurement / license-and-deploy only

Pick: Either (you run it)

Already standardized on one gateway? Unio can license, configure, and cut over MX records, then hand administration to your internal team with documented policies.

Scope a deployment

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Frequently Asked Questions

Both are mature SEGs. Mimecast is stronger when you need built-in email archiving and continuity. Proofpoint is stronger for large enterprises that want TAP's advanced targeted attack protection and TRAP's automatic remediation. For pure Microsoft 365 threat protection without archiving, an API-based solution often outperforms both.

Proofpoint's premium pricing is easier to justify at enterprise scale (5,000+ mailboxes) with its TAP attachment sandboxing, URL rewriting, and TRAP auto-pull. For SMB and mid-market, Mimecast or an API-based alternative often delivers comparable protection at lower cost.

Both work with Microsoft 365 as traditional gateways placed in front of Exchange Online Protection. However, neither scans internal email because they only see inbound traffic. For M365 specifically, API-based tools like Avanan provide additional protection by scanning internal messages.

Organizations rarely run both because they overlap heavily. Some enterprises layer Proofpoint TAP with Mimecast archiving. More commonly, you choose one SEG and supplement with an API-based tool for additional inline scanning.

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Sources & Methodology  

Specifications, pricing, and product capabilities cited on this page are sourced from public vendor documentation as of the dates shown below. Vendor product lines change quickly; verify current specs and pricing directly with each vendor before purchasing.

  1. Proofpoint states its Core Email Protection stops 99.999% of email security threats, with sandboxing for malicious URLs and attachments. Its post-delivery remediation pulls confirmed-malicious messages from all inboxes, including forwarded copies. [source] · verified 2026-07-01
  2. Proofpoint reports serving more than half of the Fortune 100 and more than half of the Fortune 1000, analyzing over 100 billion data points a day and detecting and blocking threats in more than 2.6 billion emails daily. [source] · verified 2026-07-01
  3. Mimecast protects more than 42,000 organizations and 27 million users worldwide across more than 100 countries, and analyzes 24 trillion behavioral signals annually. [source] · verified 2026-07-01
  4. Mimecast's entry-level Critical email security plan already includes email continuity plus email backup and recovery alongside AI-powered BEC protection; all three tiers (Critical, Advanced, Premium) are quote-based with no published per-user pricing. [source] · verified 2026-07-01
  5. Mimecast was named a Leader in the 2025 Gartner Magic Quadrant for Digital Communications Governance and Archiving, and its Email Archive spans email and Microsoft Teams with e-discovery, supervision, and Sync & Recover backup tooling. [source] · verified 2026-07-01
  6. The FBI's IC3 received 21,442 business email compromise complaints in 2024 with $2.77 billion in reported losses, the second-highest loss total of any tracked crime type behind investment fraud. [source] · verified 2026-07-01