Código PHP:
<form method="post" enctype="multipart/form-data" name="mod" id="modifyform">
<input name="emailmodi" required id="emailmodi" maxlength="50" type="email">
<p>Sección:<br><select name="seccionpublicacion" required id="seccionpublicacion">
<option disabled></option>
<option>1</option>
<option>2</option>
</select></p>
<input type="submit" name="submit2" id="submit2" value="Enviar">
</form>
Saludos!!