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## About Uncleanable Files

When ScanMail cannot successfully clean a file, it labels the file "uncleanable" and performs the user-configured action for uncleanable files. The default action is "Replace with text/file". ScanMail records all viruses/malware events and associated courses of action in the log file.
Some common reasons why ScanMail cannot perform the clean action are as follows:

- The file contains a Trojan, worm, or other executable program. To stop an executable from executing, ScanMail must completely remove it.
- ScanMail does not support the compression format used to compress the file. The scan engine only cleans files compressed using `pkzip` and only when the infection is in the first layer of compression.
- An unexpected problem prevents ScanMail from cleaning.