Good catch, hossman. (you++ tomorrow when I get more votes).
In Firefox it's very easy to compare two similar pages; you just Ctrl-[PageUp] and Ctrl-[PageDown], after aligning the pages to the same spot.
Doing so in this case reveals something interesting.  Exactly one line was changed from the original code:
# Original line
my $to_address = 'martin.zahn@akadia.com';
# Changed line
my $to_address = 'mugil.ragu@tcs.com';
It's interesting to note that according to tcs's website, they have a number of addresses in Chennai, where madtoperl and jesuashok have both previously said they live.
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/
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