Vi allego anche il form in html per completezza
codice:
<form action="sender.php" method ="POST" name="contactform">
                     
                      <label for="fname">First Name</label>
                      <input type="text" id="fname" name="firstname" placeholder="Your name..">
                      <label for="lname">Last Name</label>
                      <input type="text" id="lname" name="lastname" placeholder="Your last name..">
                      <label for="email">Email</label>
                      <input type="email" id="email" name="email" placeholder="your email..">
                      <label for="country">Regione</label>
                      <select id="country" name="country">
                        <option value="abruzzo">Abruzzo</option>
                        <option value="basilicata">Basilicata</option>
                        <option value="calabria">Calabria</option>
                        <option value="campania">Campania</option>
                        <option value="emilia">Emilia Romagna</option>
                        <option value="friuli">Friuli-Venezia Giulia</option>
                        <option value="lazio">Lazio</option>
                        <option value="liguria">Liguria</option>
                        <option value="lombardia">Lombardia</option>
                        <option value="marche">Marche</option>
                        <option value="molise">Piemonte</option>
                        <option value="puglia">Puglia</option>
                        <option value="sardegna">Sardegna</option>
                        <option value="sicilia">Sicilia</option>
                        <option value="toscana">Toscana</option>
                        <option value="trentino">Trentino-Alto Adige</option>
                        <option value="umbria">Umbria</option>
                        <option value="valledaosta">Valle d'Aosta</option>
                        <option value="Veneto">Veneto</option>
                        <option value="altro">Altro (specificare)</option>

                      </select>
                      <label for="subject">Subject</label>
                      <textarea id="subject" name="subject" placeholder="Write something.." style="height:170px"></textarea>
                      <input type="submit" value="Submit">
                    </form>