Rspamd communigate pro1/26/2024 ![]() 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. Fuzzy Hashes – for identifying malicious mail patterns Rspamd uses so-called fuzzy hashes.This approach achieves better results than traditionally used monogramms (or words literally speaking). This means that the input is evaluated not based on individual words, but organised into chains. Statistics – Rspamd uses a bayesian classifier based on five gramms of input.This technique is very useful for finding malicious domains. URL Black Lists – are rather similar to DNS black lists but measure reputation of domains seen in URLs.Rspamd also uses positive and grey DNS lists for checking for trusted senders. However, Rspamd doesn’t trust any specific DNS list and instead uses a conjunction of estimations to avoid mistakes and false positives. Rspamd uses a number of DNS lists including such lists as SORBS or Spamhaus. DNS Black Lists – allows to estimate reputation of sender’s IP address or network.Like SPF, this technique is widely adopted and validates that a message was sent from a specific domain. DKIM – this module validates a message cryptographic signature against a public key placed in the DNS record of sender’s domain.A number of mail systems include SPF support, such as gmail or yahoo mail. SPF – this module validates a message’s origin against the policy defined in the DNS record of sender’s domain. This feature is similar to regular expressions in SpamAssassin spam filter. Rspamd expressions are a powerful tool for filtering messages based on predefined rules. Regular Expressions Filtering – allows processing of messages, their textual parts, MIME headers and SMTP data received by the MTA against a set of expressions including both normal regular expressions and message processing functions.Some of the features built into Rspamd to fight spam include: The email message will then have a spam score applied and will either pass the email to your mailbox, reject the email outright or add a header to the email indicating possible spam. Rspamd will filter email and prevent incoming spam from reaching your mailbox by evaluating and analysing the message using a number of filtering rules such as using Regular Expressions (Regex) Filtering, Statistical Analysis, RBLs, etc. Also, Rspamd features a simple but powerful web management interface that provides the ability to set metric actions, spam scores, view spam email statistics and set spam learning from within your DirectAdmin control panel. While they both provide the same quality of spam filtering, Rspamd provides significantly faster performance and can process hundreds of email messages per second simultaneously while featuring a spam filtering engine that uses less resources than SpamAssassin. When using DirectAdmin we recommend you use Rspamd rather than SpamAssassin as your email spam filtering system.
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