Release Notes SPAMCONTROL 2.3
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FEATURES
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SPAMCONTROL is an extension mainly for qmail-smtpd. It provides the following features:

* ESMTP enhancements
- Strict RFC 2821 conformance.
- Reference SMTP Authentication (RFC 2554) implementation.
- Reference 'Mail From:' parameter parser, supporting SIZE (RFC 1870) and AUTH options.
- SMTP Authentication for qmail-remote.

* SMTP envelope Anti-Spam-Tools
- Wildmat Filters for the HELO/EHLO greeting and the 
  'Mail From: <Return-Path>' in Split-Horizon fashion.
- DNS Lookup for the HELO/EHLO greeting (A/MX) and the domain part of the 'Mail From:' (MX).
- Customizable HELO/EHLO greeting checks.
- Check, whether for Relayclients the domain part of <Return-Path> corresponds 
  to a local address (Reverse Split-Horizon).
- Tarpitting and Smart Rejection in case of too many invalid Recipients.

* Recipients extensions
- badrcptto wildmat filter.
- Restricting the number of allowed 'Rcpt To:' per SMTP session.
- Whitelisting: Controlling the reception of mails not only on a 
  rcpthosts base but rather on the complete <Forwarding-Path> with fast and 
  extensible cdb-lookup, domain-wildlisting and VERP support.

* Bounce control
- Restricting the size of bounces.
- Doublebouncetrim.
- Allow only one 'Rcpt To:' for Nullsender mails/None Delivery Reports/Bounces.

* Virus prevention
- Reference badmimetypes implementation.
- Additional badloadertypes filter.
- Qmail High Performance Scanner Interface (QHPSI).
- Customizable SMTP 554 Reply Message.

* qmail-smtpd logging
- Extensible logging format.
- Logging for failed and accepted SMTP sessions.
- qmail-mrtg interface

With SPAMCONTROL, Qmail can stand the two most common threats:

* Lexical and/or dictionary Spam attacks in particular to none-existing <Forwarding-Path> 
  and the subsequent generation of bounce messages to none-existing <Return-Path>.
* Virus Bombing and resource exhaustion due to the Virus Scanners.


CHANGES (2.2 -> 2.3)
--------------------

* Userland:
- Removed 'blackholedsender' control file.
- Improved qmail-smtpd logging.
- Removed Andree Oppermann's performance enhancement.

* Internal:
- Minimal conf-spamcontrol.
- Removed lots of configuration options; instead
  the code has been highly condensed (20% reduction)
  providing even more features.
- Strict DJB coding. 


Erwin Hoffmann, Cologne 2004-12-08