If you looking for an example to send an email from a tell-a-friend-form or other forms. this might help you:

function executeSend()
{
  [..] // your new sfForm-vodoo [..]
  // after posting form and validation
  $values = $this->form->getValues();
 
 // header
  $from = new Swift_Address( $values['email'], $values['firstname'] . ' ' . $values['lastname'] );
  $to   = new Swift_address( $values['rcpt_email'], $values['rcpt_name']);
  // subject/message
  $msg  = new Swift_Message( __( 'tellafriend.email.subject', '', 'tellafriend') ); // at this moment no body-text etc, we want multipart ...
 
  // content
  $placeholder = array();
  foreach ( $values as $key => $val ) {
    $placeholder['%'.$key.'%'] = $val;
  }
 
  // stuff, we need in the email
  sfContext::getInstance()->getRequest()->setAttribute( 'placeholder', $placeholder );
 
  // textversion
  $msg->attach(new Swift_Message_Part( sfContext::getInstance()->getController()->getPresentationFor( 'tellafriend', 'sendEmailText', $viewName = null) ));
  // htmlversion
  $msg->attach(new Swift_Message_Part( sfContext::getInstance()->getController()->getPresentationFor( 'tellafriend', 'sendEmailHTML', $viewName = null), "text/html") );
 
  $stream = $msg->build();
  //echo $stream->readFull(); die; //Dumps the email contents
 
  // and send
  $swift = new Swift(new Swift_Connection_NativeMail());
  $swift->send( $msg, $to, $from );
  $swift->disconnect();
 
}
 
function executeSendEmailText()
{
  // holds your text-version-template
  $this->placeholder = $this->getRequest()->getAttribute('placeholder');
}
 
function executeSendHTMLText()
{
  // holds your html-version-template
  $this->placeholder = $this->getRequest()->getAttribute('placeholder');
}
 

full documentation for swiftMailer you find here: http://www.swiftmailer.org/wikidocs/