If all you want is less code you could probably do something like

my %mail = (
        To   => 'mail@there.com',
        From => 'from@there.com'
    );

if($old ne $curr){
    $mail{'Subject'} = "Subject A";
    $mail{'Message'} = "Subject A message here";
}
elsif($var eq $job){
    $mail{'Subject'} = "Subject B";
    $mail{'Message'} = "Subject B message here";
} else {
    $mail{'Subject'} = "Subject C";
    $mail{'Message'} = "subject C message here";
}

$mail{smtp} = $mailserv;

sendmail(%mail);
[download]

-Robert

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Hopefully there will be a witty sig here at some point