Odesílání mailů se spouští asynchronně, takže se neblokuje UI.

src/main/java/info/bukova/isspst/mail/MailerWithAttachement.java

@@ -8,6 +8,7 @@ import org.springframework.core.io.InputStreamSource;
 import org.springframework.mail.MailParseException;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.scheduling.annotation.Async;
 
 public class MailerWithAttachement implements Mailer {
 	
@@ -19,6 +20,7 @@ public class MailerWithAttachement implements Mailer {
 	}
 	
 	@Override
+	@Async
 	public void send(MailMessage message) {
 		MimeMessage mimeMessage = sender.createMimeMessage();
 

src/main/java/info/bukova/isspst/mail/SimpleMailer.java

@@ -1,6 +1,7 @@
 package info.bukova.isspst.mail;
 
 import org.springframework.mail.javamail.JavaMailSender;
+import org.springframework.scheduling.annotation.Async;
 
 public class SimpleMailer implements Mailer {
 	
@@ -12,6 +13,7 @@ public class SimpleMailer implements Mailer {
 	}
 
 	@Override
+	@Async
 	public void send(MailMessage message) {
 		if (message.getFrom() == null || message.getFrom().isEmpty()) {
 			if (from == null || from.isEmpty()) {