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use My::Customer;
use CGI;
my $cgi = CGI->new;
...
my $cust = My::Customer->load_from_id($cust_id);
$cust->email($email);
$cust->save;

use Class::CGI
  handlers => {
    customer => 'Class::CGI::Customer'
...
# validate email
$cust->email($email);
$cust->save;