Mail Baby is a transactional outbound email provider who offer email filtering using a simple billing model and is a brand owned and operated by InterServer, a leading provider of managed web hosting, Cloud VPS hosting and dedicated servers. In order to add the custom spam filtering rules to Rspamd, we will be using external Rspamd spam filtering rules provided by mail.baby. In addition we will also add a DNS and URL White List to reduce false positives. The custom spam filtering rules we will be adding to Rspamd will use a number of different techniques and make use of the built in features such as Regular Expressions Filtering, DNS Black Lists, URL Black Lists and checking/building Fuzzy Hashes. In this guide, we will explain how to add custom spam filtering rules to Rspamd to enable better spam email filtering and/or reduce false positive rates. While Rspamd provides their own prepared rules by default, we can easily add our own. The spam filtering rules are an essential part of the spam fighting techniques and systems. Moreover, this allows for feeding Rspamd with data from honeypots without polluting the statistical module. Furthermore, fuzzy hashes are used not merely for textual data but also for images and other attachments types in email messages. Rspamd has internal storage of such hashes and can block mass spam sendings quickly based on users’ feedback. ![]() Unlike normal hashes, these structures are designed to hide small differences between text patterns allowing to find similar messages quickly.
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