Cannot send email from server heroku using spring javamail

Question

I tried to send Email from Heroku, using Spring javamail, but got error.

My code:

import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.stereotype.Service;

@Service("mailService")
public class JavaMailerServiceImpl {

    private MailSender mailSender;
    public JavaMailerServiceImpl(JavaMailSenderImpl mailSender) {
        this.mailSender = mailSender;
    }

    public void sendMail(String to, String subject, String body){
        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(body);
        mailSender.send(message);
    }
}

Beans:

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
    <property name="host" value="smtp.gmail.com"/>
    <property name="port" value="587"/>
    <property name="username" value="**********@gmail.com"/>
    <property name="password" value="********"/>
    <property name="javaMailProperties">
        <props>
            <prop key="mail.transport.protocol">smtp</prop>
            <prop key="mail.smtp.auth">true</prop>
            <prop key="mail.smtp.starttls.enable">true</prop>
            <prop key="mail.debug">true</prop>
        </props>
    </property>
</bean>

And controller:

    @Autowired
    private JavaMailerServiceImpl mailService;

    @RequestMapping(method = RequestMethod.POST)
    public String sendEmail(HttpServletRequest request) {
        String recipientAddress = request.getParameter("recipient");
        String subject = request.getParameter("subject");
        String message = request.getParameter("message");
        mailService.sendMail(recipientAddress,subject,message);
    }`

At localhost:8080 and localhost:5000, test completed successfully, but on heroku server I have exception:

Authentication failed; nested exception is javax.mail.AuthenticationFailedException: 534-5.7.14 Please log in via your web browser and 534-5.7.14 then try again. 534-5.7.14 Learn more at 534 5.7.14 https://support.google.com/mail/answer/78754 j4sm53975482wjg.20 - gsmtp

I performed all recommendations from google. Can you help me solve this problem. Maybe link or something like that. Thank you.

Answer 1

I solved this activating DisplayUnlockCaptcha :

https://accounts.google.com/b/0/DisplayUnlockCaptcha

Also activating the Lesssecureapps

https://www.google.com/settings/security/lesssecureapps

And these are the properties :

#Mail properties
spring.mail.default-encoding=UTF-8
spring.mail.host=smtp.gmail.com
spring.mail.username=--
spring.mail.password=--
spring.mail.port=587
spring.mail.protocol=smtp
spring.mail.debug=true
spring.mail.smtp.auth=true
spring.mail.smtp.starttls.enable=true

Answer 2

Devcenter heroku said:

The Heroku platform itself doesn’t provide an email service - but instead provides add-ons that act as backing services - that can be attached to your app to provide the service.

Consult the Heroku Add-ons marketplace for an appropriate email service that matches your requirements.

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