Subject line for STDOUT output

I call a perl script from procmail that writes debugging messages to
stdout.  When procmail completes, this stdout output is delivered as a
mail file with no subject or sender.  The original email is delivered to
a mail folder defined in the procmail recipe.  The stdout message is
fine, but I would like to add a subject line in order to identify the
log in the future.  Does anyone know how to set the mail subject line
for text written to stdout?

Thank you

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