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implementing-mimecast-targeted-attack-protection

Configure Mimecast Targeted Threat Protection policies to defend email against phishing and impersonation attacks.

954|172|Updated Mar 13, 2026
Search Tags:#email security#impersonation protection#mimecast#bec#phishing protection#attachment sandboxing#url protect
One-click install
npx skills add https://github.com/xalgord/xalgorix --skill implementing-mimecast-targeted-attack-protection
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: implementing-mimecast-targeted-attack-protection
Source: https://github.com/xalgord/xalgorix/tree/main/internal/tools/skills/data/phishing-defense/implementing-mimecast-targeted-attack-protection
Command: npx skills add https://github.com/xalgord/xalgorix --skill implementing-mimecast-targeted-attack-protection

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Organizations face sophisticated phishing, spearphishing, and business email compromise attacks that bypass basic email filtering, and misconfigured Mimecast Targeted Threat Protection deployments leave gaps like weaponized URLs reaching inboxes or VIP impersonation going undetected.

Core Features & Use Cases

  • URL Protect Configuration: Set up URL rewriting, click-time analysis, and Pre-Delivery Action with Hold to block weaponized links before delivery.
  • Attachment Protect Sandboxing: Configure Safe File conversion and Dynamic Configuration sandboxing for executables, Office documents, PDFs, and archives.
  • Impersonation Protect Policies: Deploy Hit 3 default detection plus Hit 1 VIP definitions for executives to catch BEC and whaling attempts.
  • Internal Email Protect: Enable journaling-based scanning of internal email to detect lateral phishing from compromised accounts.
  • Use Case: A security team rolling out Mimecast TTP pilots the policies on 50-100 users, validates with test URLs, EICAR attachments, and VIP-impersonation emails, then tunes false positives before organization-wide deployment.

Quick Start

Walk me through configuring Mimecast Targeted Threat Protection with URL Protect, Attachment Protect, Impersonation Protect, and Internal Email Protect for my Microsoft 365 environment.

Frequently Asked Questions about implementing-mimecast-targeted-attack-protection

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I configure Mimecast URL Protect to block weaponized links?▼

Create a URL Protect definition under Gateway Policies with rewriting enabled for inbound messages, then set Pre-Delivery Action to Hold so URLs are checked before delivery. This catches links weaponized between delivery and click, a gap in rewrite-only mode.

How to set up Mimecast Impersonation Protect for executives?▼

Create a Hit 1 VIP Impersonation Protect definition for CEO, CFO, and finance leadership that flags emails matching a single indicator like display name similarity or reply-to mismatch. Keep the default Hit 3 threshold for the general population.

Does Mimecast Attachment Protect sandbox all file types?▼

Attachment Protect scans executables, Office documents, PDFs, and archives using Safe File conversion or Dynamic Configuration full sandboxing. Dynamic mode handles behavior-based payloads but complex files can take up to about seven minutes to analyze.

Can Mimecast detect phishing sent from compromised internal accounts?▼

Yes, Internal Email Protect scans internal and outbound email when journaling is configured from Microsoft 365 or Google Workspace. Enable URL and attachment scanning on internal mail to detect lateral phishing from compromised accounts.

Why is Mimecast URL Protect not blocking malicious links?▼

Common causes include rewrite-only mode without Pre-Delivery Hold, over-broad permitted senders or managed URLs bypassing scanning, and policies not applied to the affected user group. Verify the Hold setting and scope exceptions narrowly.

What are the prerequisites for deploying Mimecast Targeted Threat Protection?▼

You need a Mimecast Email Security license with the TTP add-on, administrative access to the Administration Console, MX records routing through Mimecast, and a Microsoft 365 or Google Workspace environment. Understanding SPF, DKIM, and DMARC is also recommended.

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