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.

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

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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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