MimeMessage message = javaMailSender.createMimeMessage();
try {
message.setContent(text, "text/html");
MimeMessageHelper messageHelper = new MimeMessageHelper(message, true);
messageHelper.setTo(email);
messageHelper.setSubject("Подвтерждение регистрации на Abacus.ru");
messageHelper.setText(text, true);
} catch (MessagingException e) {
throw new IllegalArgumentException(e);
}

javaMailSender.send(message);