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Assp
Jul 20, 2023
Anti-Spam SMTP Proxy
Anti-Spam SMTP Proxy is a spam filter that sits on port 25 in front of your regular SMTP server sendmail, postfix, qmail, etc.
ASSP performs a number of configurable spam checks, and on detecting a spam message, provides an immediate 5xx SMTP error code back to the client. Non-spam messages are passed to your regular SMTP server for further processing and delivery. ASSP includes SSL and IPv6 support. It is a single script with a web-based configuration tool.
ASSP offers - a whitelist of known good senders - Bayesian checks on message headers and contents - recipient address validation using LDAP and RFC822 conformance - relay denial - HELO checking - SPF Sender Policy Framework checking - DNSBL DNS Block List checking using many DNSBL services - various SMTP error modes detection - Virus detection and many other spam detection techniques.
See also http//assp.sourceforge.net/
Checkout these related ports:
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- Xmailbox - Mailbox checker with sound and animation for X Window System
- Xmail - X-based interface to the Berkeley mail program
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