Send email from Spring Boot over SMTP

Set Spring Mail properties to Unitpost SMTP and send with JavaMailSender. Port 587, STARTTLS, username `unitpost`.

1. 1

   Set mail properties

   Properties

   spring.mail.host=smtp.unitpost.com
   spring.mail.port=587
   spring.mail.username=unitpost
   spring.mail.password=${UNITPOST_API_KEY}
   spring.mail.properties.mail.smtp.auth=true
   spring.mail.properties.mail.smtp.starttls.enable=true

2. 2

   Send with JavaMailSender

   Java

   MimeMessage message = mailSender.createMimeMessage();
   MimeMessageHelper helper = new MimeMessageHelper(message, true);
   helper.setFrom("you@yourdomain.com");
   helper.setTo("customer@example.com");
   helper.setSubject("Hello from Spring");
   helper.setText("<p>Sent via SMTP.</p>", true);
   mailSender.send(message);

3. 3

   Verify delivery

   Check Activity.