You can require the presence of certain form parameters, and even for an exact magic value for a particular parameter, which you can set as a hidden input value in your form. The script should reject sending any mail if this condition isn't met.
It can't stop the script from being executed, but it can be used to make it to refuse to actually do anything.
The code can look something like (untested, it's just an idea for a starting point):
unless(param('magicvalue') && param('magicvalue') eq 'magicpassword')
print header(-status => 403),
print "<html>Mail script only, not for browser viewing</html>";
exit;
}
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