Question

Does any can help with an example source code to send email in drupal 7.
Can any one help with the contact_submit function to use drupal_mail().
I’m using custom module :

function contact_menu() {
  $items['contact'] = array(
    'title' => 'contact form',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('contact_form'),
    'access arguments' => array('access content'),
  );

  return $items;
}

function contact_form() {
  $form['intro'] = array(
    '#markup' => t('Use this form to send a message to an e-mail address. No spamming!'),
  );
  $form['email'] = array(
    '#type' => 'textfield',
    '#title' => t('E-mail address'),
    '#required' => TRUE,
  );
  $form['message'] = array(
    '#type' => 'textarea',
    '#title' => t('Message'),
    '#required' => TRUE,
  );
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Submit'),
  );

  return $form;
}

    function contact_validate($form, &$form_state) {
      if (!valid_email_address($form_state['values']['email'])) {
        form_set_error('email', t('That e-mail address is not valid.'));
      }
    }
function contact_form_submit($form, &$form_state) {
//What i should write here ???
}

Answer 1

Examples module contains number of examples to get started with, including emails.
see it in api site here
See drupal_mail() function to see function params and user examples as well as function use.

GIYF.