MailServiceImpl.sendMail(): enable e-mail addresses validation.

No functional changes.

Author: php-coder

src/main/java/ru/mystamps/web/service/MailServiceImpl.java

@@ -130,6 +130,7 @@ private void sendMail(
 				@SuppressWarnings("PMD.SignatureDeclareThrowsException")
 				public void prepare(MimeMessage mimeMessage) throws Exception {
 					MimeMessageHelper message = new MimeMessageHelper(mimeMessage, "UTF-8");
+					message.setValidateAddresses(true);
 					message.setTo(email);
 					message.setFrom(new InternetAddress(robotEmail, "My Stamps", "UTF-8"));
 					message.setSubject(subject);