For my mbox file the following one-liner gives the same output as your program, except that the columns are reversed (as requested) and the data is unsorted:
perl -lane '$h{"--$F[2]-$F[3]-$F[4]--$F[6]"}++ if /^From /; /
END{print $_, "\t", $h{$_} for keys %h}' SPAM-mbox
If you need sorted data you could use the system sort or add sort before keys above:
--
John.
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