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Scan within archives - This includes an option to exclude file extensions from being checked for mismatch from the original extension.

Recursive archives - These are nested archives containing multiple levels of sub-archives i.e.The checks performed by the Decompression engine include: MailEssentials supports a number of rules on how compressed attachments (.rar. This article delves into more details on how the Decompression Engine works using different filters that can be configured to effectively identify and block emails having unwanted compressed files. The Decompression engine extracts and analyzes archives (compressed files) attached to an email. Advanced Content Filtering blocks emails based on text in the header, subject, or body of the email, using text search or regular expressions.Decompression Engine blocks emails with specific types of compressed files within the email, suchĪs password-protected archives, recursive archives, and so on.Attachment Filtering blocks emails based on the type or size of its attachment(s).Keyword Filtering blocks emails based on keywords in the body, subject and/or attachments.MailEssentials provides 4 independent Content filtering engines which are: IntroductionĬontent Filtering engines allow MailEssentials to scan the content of emails and attachments, and block emails containing content matching any configured content filtering rules. The engine checks if the scanned archive infringes any of the rules configured in the Decompression Engine node in the MailEssentials’ Content Filtering configuration. The Decompression engine is one of the Content Filtering scanning modules that extracts and analyzes archives (compressed files such as.