Ttdfjt

 $name = $post["name"];
 $email = $post["email"];
 $address_line_1 = $post["address"]; 
 $attachment = $post["attachment"]; 
 $body = "";

 $to = "abc@gmail.com";
 $subject = "Career Inquiry";
 $body .= "<p>New Career Inquiry.</p>";
 $body .= "<p>Name : " . $name . "<p>";
 $body .= "<p>Email : " . $email . "<p>";
 $body .= "<p>Address Line 1 : " . $address_line_1 . "<p>";
 //$body .= "<p>Address Line 2 : " . $address_line_2 . "<p>";
 //$body .= "<p>Address Line 3 : " . $address_line_3 . "<p>";
 //$body .= "<p>City : " . $city . "<p>";
 //$body .= "<p>Post Code : " . $postcode . "<p>";
 //$body .= "<p>Country : " . $country . "<p>";

 $body .= "<p>Kind regards,</p><p>example Admin</p>";

 $from = $email;

 $mail = Mage::getModel('core/email');
 $mail->setToName('Pranav');
 $mail->setToEmail($to);
 $mail->setBody($body);
 $mail->setSubject($subject);
 $mail->setFromEmail($from);
 $mail->setFromName($name); //Set from name
 $mail->setType('html');// YOu can use Html or text as Mail format
 //$mail->setBodyHTML($body); // your content or message

 //add attachment start 
 $base_path = Mage::getBaseDir('base');
 $uploadfile = $base_path."media\resume\" . basename($_FILES['attachment']['name']);
 $filename =$_FILES['attachment']['name'];
 move_uploaded_file($_FILES['attachment']['tmp_name'], $uploadfile);
 $mail->addAttachment($uploadfile, $filename);
 //add attachment end 

 $mail->send();

 Mage::getSingleton('core/session')->addSuccess('Your inquiry was submitted and will be responded to as soon as possible. Thank you for contacting us.');
 $this->_redirect('*/*/');
 return;

Add Attachment :-

$mailTemplate->getMail()->createAttachment(
 file_get_contents(Mage::getBaseDir('base') . '/media/file/file.pdf'), //location of file
 Zend_Mime::TYPE_OCTETSTREAM,
 Zend_Mime::DISPOSITION_ATTACHMENT,
 Zend_Mime::ENCODING_BASE64,
 'file.pdf'
 );
 $mailTemplate->send('toemail@email.com','subject','set message');

You can use this code in phtml or controller to send mail with attached file

$mailTemplate = Mage::getModel('core/email_template');
$mailTemplate->setSenderName('Sender Name'); 
$mailTemplate->setSenderEmail('sender@sender.email');
$mailTemplate->setTemplateSubject('Subject Title');
$mailTemplate->setTemplateText('Body Text');
// add attachment
$mailTemplate->getMail()->createAttachment(
 file_get_contents(Mage::getBaseDir('base') . '/media/file/file.pdf'), //location of file
 Zend_Mime::TYPE_OCTETSTREAM,
 Zend_Mime::DISPOSITION_ATTACHMENT,
 Zend_Mime::ENCODING_BASE64,
 'file.pdf'
);
$mailTemplate->send('toemail@email.com','subject','set message');