MIMEDefang
Email Security
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Commercial Alternatives
Key Features
Perl-Based Filtering Policies
Express filtering policies in Perl rather than C, making it quick and easy to write high-performance mail filters with the flexibility of a full programming language.
Sendmail Milter Integration
Uses Sendmail's Milter API to participate in SMTP connections, scanning messages once per message rather than per recipient for CPU efficiency.
Virus and Spam Filtering
Supports integration with SpamAssassin for spam detection and various antivirus scanners including ClamAV, with automatic detection of installed scanners.
MIME Message Manipulation
Can delete attachments, convert file formats (e.g., Word to HTML), replace attachments with URLs, add disclaimers, and implement sophisticated access controls.
Pros and Cons
Pros
Complete Open Source Freedom
GPL-licensed framework with full source code access, no licensing costs, and complete control over customization and deployment.
High Performance Architecture
Scans messages once per message rather than per recipient, making it more CPU-friendly than procmail-based systems with multiplexed processing.
Mature and Stable Platform
In use since 2000 with thousands of installations worldwide, proven stability and reliability in production environments.
Highly Flexible and Customizable
Perl-based filtering allows for sophisticated custom policies, integrations with multiple tools, and complete control over mail processing logic.
Cons
Sendmail Dependency
Requires Sendmail as the MTA and is not compatible with other mail transport agents, limiting deployment options for organizations using different MTAs.
Technical Complexity
Requires significant technical expertise in Perl programming, Sendmail configuration, and system administration for proper implementation and maintenance.
Community-Only Support
Technical support primarily provided through mailing lists and community forums, no commercial support option available for critical business needs.
Mail Message Modification
Potentially alters email message bodies, breaking the mail transfer agent convention of not modifying messages, which may cause compatibility issues.
Feature Comparison
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