mxallowd is a daemon for Linux Netfilter (using libnetfilter-queue) and BSD pf (using pflog) which implements a slightly improved nolisting mechanism. It requires your name server to be configured to return two MX IP addresses, and the one with higher priority must not run a mail server on port 25. mxallowd blocks attempts to connect to the mail server unless the sender tries to connect to the first mail server before the second. Since most spammers will attempt direct connections to each mail server, they will be blocked.
Textmail filters a mail message or mbox, replacing MS Word, MS Excel, HTML, RTF, and PDF attachments with the plain text contained therein. By default, the following attachments are also deleted: image, audio, video, and MS Windows executables. MS winmail.dat attachments are replaced by any attachments contained therein, which are then replaced by text or deleted in the same fashion. Any of these actions can be suppressed with the command line options. Mail headers can also be selectively deleted.
PDFassassin is a module for SpamAssassin that allows for the scanning of PDF files in email message attachments. Email bodies are scanned upon connection and checked for PDF attachments. Text is extracted from the PDF via pdftotext and scanned by SpamAssassin. Should the PDF contain images, the gocr program is called to extract the text content. The total spam score of the PDF is compared against the global required_score setting; if it's higher, a score equal to the one specified in pdf.cf is appended to the overall score of the email message.
DynaStop is a utility to examine IPv4 based addresses for Exim and procmail for the purpose of filtering based upon patterns defined by the administrator. This can be a pivotal factor in email filtering and server load management, since dynamic IP addresses are typically used for dial-up, DHCP, and DSL accounts. All of which have a designated mail exchange server through which all outbound mail flows as defined with many, if not most, large Internet service providers.
Aquarium is a text filtering package written in PHP. It filters nearly all four-letter words, profanities, curses, and pornographic language from any text, while filtering nearly no benign words. Aquarium can keep your blog, forum, guestbook, or other dynamic Web application clean and suitable for all ages.
Stream Replace replaces binary data in streams (from stdin to stdout). It has two parameters: you pass a string that should literally match, and the replacement string. On stdout, every occurrence will be replaced, byte by byte. It does a job 'sed' usually cannot do: change non-text files.
COMDOM Antispam is a high-capacity platform designed for the requirements of ISPs and other large organizations that must fight spam. COMDOM is a powerful anti-spam system operating as a stand alone mail gateway with relay control, authentication, and load balancing support. The system consequently can be used together with mail servers or as a stand alone gateway for several mail servers. The robustness, flexibility, and the high data throughput capacity of COMDOM Antispam allow for the software to be deployed for a range of solutions.
unoconv converts between any document formats that LibreOffice understands. It uses LibreOffice's UNO bindings for non-interactive conversion of documents. Supported document formats include Open Document Format (.odt), MS Word (.doc), MS Office Open/MS OOXML (.xml), Portable Document Format (.pdf), HTML, XHTML, RTF, Docbook (.xml), and more, but image, spreadsheet and presentation formats are also supported.