Hold or delete message files containing specific substrings
    in their envelope From: address, Subject: line, or content.
    By default, message files are held (/HOLD). Specify /DELETE to
    instead delete matching message files. The /CONTENT, /ENV_FROM,
    and /SUBJECT qualifiers are used to specify the substrings for
    which to search.

    Any combination of /CONTENT, /ENV_FROM, and /SUBJECT may be
    specified. However, only one of each may be used. The /MATCH
    qualifier controls whether a message file must contain all
    (/MATCH=AND, the default) or only one of (/MATCH=OR) the
    specified substrings in order to be held or deleted. The default
    is /MATCH=AND.

    By default, each substring to be searched for must be at least
    24 bytes long (/MIN_LENGTH=24). This is a safety measure: the
    longer the substring, the less likely the chance of false "hits".
    Use the /MIN_LENGTH qualifier to override this limit. Also
    by default, only message files identified by the queue cache
    database are searched (/DATABASE). Use the /DIRECTORY_TREE
    qualifier to instead search all message files actually present
    in the channel queue directory tree.

    The optional channel parameter restricts the search to message
    files in the specified channel. The channel parameter may use *
    and ? wild cards.

    The /THREADS qualifier may be used to accelerate searching on
    multiprocessor systems by dividing the work amongst multiple,
    simultaneously running threads. To run n simultaneous searchingg
    threads, specify /THREADS=n. The value n must be in the range
    1-8. The default is /NOTHREADS.