mail ($_POST['поле_1'], "My Subject", "Line 1\nLine 2\nLine 3");
mail ($_POST['поле_2'], "My Subject", "Line 1\nLine 2\nLine 3");
mail ($_POST['поле_3'], "My Subject", "Line 1\nLine 2\nLine 3");
mail ($_POST['поле_4'], "My Subject", "Line 1\nLine 2\nLine 3");