Scanning limits

MetaDefender™ Cloud Email Security is designed to provide robust protection against email-borne threats by analyzing attachments using advanced engines. To maintain optimal performance, reliability, and resource allocation, the platform enforces specific scanning limits on files (attachments) and archives.

This article explains each of the current file scanning limitations.

ParameterValueDescription
Max file size256MBThis is the maximum size of a single file that can be uploaded and scanned.
Max archive file size256MBThe total size of an archive (e.g., .zip, .rar) after decompression must not exceed this limit.
Max archive depth25This limits how deeply nested an archive can be. For example, an archive within an archive counts as one depth level.
Max archive files10,000The maximum number of files that can be extracted and scanned from an archive.

Engine file type support

Certain antivirus engines specialize in scanning only particular file types, ignoring others. The table below identifies each engine and its corresponding supported file types.

EngineFile types
OPSWAT Predictive Alin AIPE, PDF & Microsoft Office documents
RocketCyberAny windows file that contains a PE header. That would include the file format for Windows executables, object code, and DLLs in both 32-bit and 64-bit versions.
Webroot SMDPE and JS embedded on PDF

Other antivirus engines, beyond those listed above, can scan all file types without restrictions.
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Scanning limitsEngine file type support