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## Compression Types

The ScanMail scan engine can extract and scan files compressed using any of the most popular compression types (listed below). ScanMail can also check for viruses/malware being "smuggled" within nested compressions, for example, an infected file that is zipped, ARJ-compressed, MS-compressed, and zipped again.
The maximum number of recursive scan layers is 20. You can configure this limit from Security Risk Scan → Target → Scan Restriction Criteria.

#### Supported Compression Types

Archive created by LHA (`.lzh`) | MacBinary (`.bin`)
Archive created by Pkzip (`.zip`) | Microsoft Cabinet (`.cab`)
Archive created by RAR (`.rar`) | Microsoft Compressed/MSCOMP
Archive created by Tar (`.tar`) | MIME (`.eml`; `.mht`)
ARJ Compressed archive (`.arj`) | Teledisk format (`.td0`)
BINHEX (`.hqx`) | Unix BZ2 Bzip compressed file (`.bz2`)
GNU Zip (`.gz`; `.gzip`) | UUEncode (`.u`)
LZW/Compressed 16bits (`.Z`) | WinAce (`.ace`)