spamdyke.org

What It Is

spamdyke is a “drop-in” connection-time SMTP anti-spam filter for qmail. It monitors and intercepts SMTP connections between remote hosts and a qmail server, rejecting spam while the sender is still online, so there is no need for additional mail processing or storage workflows. It is positioned more as a traditional self-hosted mail gateway component than as a cloud email security service.

Core Capabilities

In terms of protection, spamdyke covers reverse DNS checks, MX checks, local IP/reverse DNS allowlists and blocklists, DNS RBL/RHSBL, sender and recipient allowlists/blocklists, mail header content matching, greylisting, earlytalker blocking, recipient count limits, timeout controls, and prevention of unauthorized relaying. For deployment, it is designed for qmail, and the text explicitly states that qmail does not need to be patched or recompiled. Additional capabilities include providing SMTP AUTH and TLS for unpatched qmail, outputting readable logs via syslog, and recording SMTP traffic files for diagnostics.

Pricing and Compliance

The crawled content does not provide pricing, licensing model, payment methods, or commercial edition information, nor does it disclose any compliance certifications. Support mainly appears to be through an active mailing list, with no mention of SLAs, vendor ticketing, managed services, or enterprise support. As a result, the available information is insufficient for enterprise compliance procurement, vendor audits, and long-term assurance.

Pros and Cons

The main advantages are that connection-stage blocking can save resources otherwise spent on later scanning and storage, and the filtering options are extensive and mostly configurable individually. It is also qmail-friendly, making it especially suitable for older systems where administrators do not want to modify qmail. The drawbacks are also clear: the latest release information dates back to 2014, and historical announcements mention fixes for crashes and a buffer overflow that could potentially be remotely exploited. Maintenance activity and security response therefore need close verification. It also lacks clear information on modern web management, centralized alerting, reporting, and compliance capabilities.

Who It’s For and Access from China

spamdyke is best suited to administrators still maintaining qmail/Plesk mail environments who need lightweight connection-level anti-spam filtering. It is not a good fit for teams looking for managed services, visual dashboards, or enterprise-grade compliance support. Access from China is not covered in the source text and is therefore unknown; payment methods are also not specified. For a new email security stack, alternatives such as SpamAssassin, Rspamd, Amavis, Postfix postscreen, or commercial email security gateways are also worth evaluating.