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Rspamd is an advanced spam filtering system and email processing framework that allows evaluation of messages by a number of rules including regularexpressions, statistical analysis and custom services such as URL black lists. Each message is analysed by Rspamd and given a verdict that might be used by MTA for further processing (e.g. to reject a message, or add a special header indicating spam) along with other information, such as possible DKIM signature or modifications suggested for a message. ...
Ontea - Pattern based Semantic Annotation Platform. Ontea search or create semantic meta data from text or documents using pattern based approaches. Implementation currently includes regularexpressions (regex) patterns
This is an Open Source Project to implement the Plug-In component of SpamPal that will allow the implementation of Pearl-Regular-Expressions similar as are implemented in the *nix environment for the Application known as SpamAssassin or SA.
Camel's Eye is a powerful POP3 email filter. It supports DNS-based Blackhole Lists (DNSBL/RBL), Razor, and rules that search header or body. Features include regularexpressions, scoring, deletion on server, automatic whitelisting through an SMTP proxy.
pop3spam is a POP3 client which connects to a POP3 server and deletes
unsolicited mail in-place. It's possible to check for messages that exceed a
certain limit and to scan header lines for special patterns (regularexpressions).
FiPPS is a simple POP3 proxy server for Windows which scans mail headers with regularexpressions for spam/mailworms and deletes the mails without downloading them.
Mboxgrep is a small, non-interactive utility that scans mail
folders for messages matching regularexpressions. It does matching against basic and extended POSIX regularexpressions, and reads and writes a variety of mailbox formats.