-S is all very well, but it's a bit hazardous as to what it deletes.
Attached file is a diff that provides a -M<text> option that lists
messages in the queue that match the given subject.
Unified diff for above
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You can use something like:
qmHandle -l | grep -4 expression
to simulate this feature. Anyhow, I'll put it in the list of
what to add. ;)