MailScanner review
A free Linux mail filter with broad server integration and configurable message inspection.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MailScanner is a self-hosted, open-source email security gateway for Unix-like mail servers. It is designed for Linux administrators who need a free mail filter that can process messages for spam, viruses, phishing, and other malicious content. Its gateway deployment model fits organizations running their own mail infrastructure, with support for Sendmail, Postfix, and Exim alongside Milter-based mail processing. The software also supports installation packages and configuration guidance for several Linux distributions and generic Unix systems.
Its strongest area is configurable inspection across several message types. MailScanner supports spam filtering, virus scanning through external scanners such as ClamAV, phishing detection with phishing-site list updates, and attachment filename and file-type rules. It can unpack archives and documents for inspection, then place infected or unscannable messages in quarantine storage. Integrations with ClamAV and SpamAssassin extend its scanning workflow, while support for Sendmail, Postfix, Exim, and ZMailer gives administrators options within established mail-server environments. This makes it a practical fit for teams that want control over filtering rules and processing behavior.
The trade-off is operational scope. MailScanner is centered on self-hosted Linux and Unix-like mail systems rather than cloud platforms, and it does not provide verified impersonation protection, outbound filtering, or sandboxing. Administrators should therefore choose it when free, open-source gateway filtering and mail-server compatibility are the priorities. Organizations seeking broader protection across cloud email, outbound traffic, impersonation threats, or sandbox analysis should choose a product built around those capabilities instead.
MailScanner pros and cons
- Where it wins
- Free, open-source deployment for Linux and self-hosted environments
- Integrates with Sendmail, Postfix, Exim, ClamAV, and SpamAssassin
- Combines phishing detection, quarantine, and attachment inspection rules
- Where it doesn't
- No verified impersonation protection or outbound filtering
- No sandboxing or cloud-platform deployment
- Requires administration of a self-hosted Unix-like mail gateway
MailScanner fact sheet, pricing and score →
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