How to decrypt encrypted e-mail on SHA-256?

I am encrypting an email and saving it in the database, how do I decrypt the same email that was encrypted.

Follow the code I used to encrypt.

public String getEmailCriptografado(String email){
    email = email.toLowerCase();
    email = Normalizer.normalize(email, Normalizer.Form.NFD);
    Pattern pattern = Pattern.compile("\p{InCombiningDiacriticalMarks}+");
    pattern.matcher(email).replaceAll("");

    String emailCritptografado = "";

    try {
        MessageDigest algoritmo = MessageDigest.getInstance("SHA-256");

        try {
            byte messageDigest[] = algoritmo.digest((email)
                    .getBytes("UTF-8"));
            StringBuilder hexString = new StringBuilder();

            for (byte b : messageDigest) {
                hexString.append(String.format("%02X", 0xFF & b));
            }

            emailCritptografado = hexString.toString();
            System.out.println(emailCritptografado);

        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


    return emailCriptografado;
}

Is there any way to decrypt in this way?