PHP mail function is not sending any messages [duplicate]

Answer 1

Your HTML is not valid. You can't have <td> and <tr> outside the form, but </tr> and </td> inside the form. These tags have to be nested properly. When you don't nest correctly, the browser will add all the necessary end tags to the inner tags. The result of this is that your form is ending after the named23 element, and the checkbox and submit button are not part of the form.

You should put the entire table inside the <form>...</form> tags.

Answer 2

You need close </form> at the end of the code, because all inputs should be include within form, specially <input type="submit" name="ch_but_logon" value="Entrer"> that are used to validate in your PHP if (isset($_POST['ch_but_logon'])) {

And you need remove "dot" before "equals" symbol because $txt was't created before, and this concat operation are unnecessary:

$txt = $_POST['named23'];