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Mail Traffic Filtering Scheme

Besides mail filters, other services are involved in filtering mail traffic on SafeUTM.

The complete scheme and sequence of filtering is shown in the diagram.


image-1661628432987.png1. Mail Traffic Filtering Scheme.png

Kaspersky's Antispam module, in turn, uses its own set of techniques to filter spam. It provides a high level of spam detection with low false positives (0.003-0.005% of the total number of messages). To protect users, a large set of spam recognition technologies using external cloud services (DNSBL, SPF and SURBL) and proprietary algorithms are used: signature analysis of text and graphics, linguistic heuristics, as well as real-time UDS queries. All links in emails are also checked, emails with links to phishing resources are blocked.

The white list in the mail settings ensures passage of emails without filtering, starting from the level of "Filtering by gray lists and checking DKIM/SPF". Preliminary spam filters are triggered for any recipients.