- Support DNS whitelists.
- Improve physical page locality of the DCC server's use of the database hash table
and so improve server performance.
- Reduce dccifd thread stack size to 512 KBytes for busy 32-bit systems
- Dccproc, dccm, and dccifd decode HTML &#xxx character references in URLs.
- Dccproc, dccm, and dccifd convert UTF-8 domain names to Punycode
before checking DNS blacklists.
- Fix reporting of rogue server-IDs.
- Fix dccproc, dccifd, and dccm crash in parsing Received: fields with IPv6 addresses.
- Fix DNSBL bugs in parsing http://example.com?parameter and http://example.com:80
- Deal with trailing '.' and other punctuation URLs in dccm, dccifd, and
dccproc. This changes the FUZ1 and FUZ2 checksums in some cases.
- Fix a rare crash of dccd, the server daemon.
The Distributed Checksum Clearinghouses or DCC is an anti-spam content filter
that runs on a variety of operating systems. As of the middle of 2007, it
involves millions of users, more than six hundred thousand client computer
systems, and more than 250 servers collecting and counting checksums related to
more than 300 million mail messages on week days. The counts can be used by
SMTP servers and mail user agents to detect and reject or filter spam or
unsolicited bulk mail. DCC servers exchange or "flood" common checksums. The
checksums include values that are constant across common variations in bulk
messages, including "personalizations".
