$mh = Loader::helper('mail');

$zmo = $mh->getMailerObject();
$zm = $zmo['mail'];
$zm->setType(Zend_Mime::MULTIPART_RELATED);
$zm->setBodyText('This is the text of the mail.');
$zm->setFrom('noreplay@server.net', 'Some Sender');
$zm->addTo('sendTo@gmail.com', 'Some Recipient');
$zm->setSubject('Zend TestSubject');

$fh = Loader::helper('file');
$image = $fh->getContents( File::getByID(19) );

$at = new Zend_Mime_Part($image);
$at->type        = 'image/jpeg';
$at->disposition = Zend_Mime::DISPOSITION_INLINE;
$at->encoding    = Zend_Mime::ENCODING_BASE64;
$at->filename    = 'justFileName.jpg';
$zm->addAttachment($at);

$zm->send();