springboot javax.mail.MessagingException: Could not connect to SMTP host

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springboot整合邮件服务时，发送html邮件报错javax.mail.MessagingException: Could not connect to SMTP host

查资料发现是：ssl连接信息未配置导致

解决方案：

spring.mail.properties.mail.smtp.ssl.enable=true

加上此即可

参考https://stackoverflow.com/questions/31721298/spring-boot-1-2-5-release-sending-e-mail-via-gmail-smtp