Score for ClamAV heuristics (Encrypted Archives/Documents, PhishingScanURLs, ...).
+`extract_text`: `<boolean>` ('default =' `0`)::
+
+Extract text from attachments (doc, pdf, rtf, images) and scan for spam.
+
`languages`: `(all|([a-z][a-z])+( ([a-z][a-z])+)*)` ('default =' `all`)::
This option is used to specify which languages are considered OK for incoming mail.