mail:
    host: smtp.gmail.com
    port: 465
    username: myemail@gmail.com
    password: mypassword

Caused by: javax.mail.MessagingException: Could not connect to
SMTP host: smtp.gmail.com,
port: 465, response: -1

org.springframework.mail.MailSendException:
Failed messages:    com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue
a STARTTLS command first. jm6sm60863600wjb.27 - gsmtp

mail:
  host: smtp.gmail.com
  port: 587
  username: myemail@gmail.com
  password: mypassword
  properties:
    starttls.enable: true

mail:
    host: smtp.gmail.com
    port: 587
    username: mymail@gmail.com
    password: mypassword
    protocol: smtp
    tls: true
    properties.mail.smtp:
        auth: true
        starttls.enable: true
        ssl.trust: smtp.gmail.com

spring:
  mail:
    default-encoding: UTF-8
    host: smtp.gmail.com
    username: <Gmail username>
    password: <Gmail password>
    port: 587
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
    protocol: smtp
    test-connection: false