The following example shows holding all message files in the
      PMDF queue area that have the string "real estate" in the
      Subject: header and have the string "ownership.com" in the
      envelope From: address.

 qm.maint> CLEAN/MIN_LENGTH=11/SUBJECT="real estate"

1    /ENV_FROM="ownership.com"

 %QM-I-QCLISTING, building a list of message files to scan from the queue cache
 %QM-I-SCANNING, scanning 72 message files
 %QM-I-SCANNED, scanned 72 message files in 3.7500 seconds (19.20 messages/second)
 %QM-I-HELD, held 5 message files