Some very, very minor points.
You might put the definition of $username, $password, $dsn at the very top of the script. This will make it easier to make simple modifications quickly. Something like:
use strict;
use DBI;
use Getopt::Std;
my $dsn = "DBI:mysql:$database:localhost";
my $username = 'username';
my $passwd = unpack("u", $enc_passwd);
######### No User servicable parts below ############
Also, I'm not sure what the gain is with the obscured password. It isn't too hard to say:
print unpack("u", $enc_passwd);
email: mandog
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