2019-04-08 10:41:30.069 [RMI TCP Connection(4)-192.168.1.156] WARN [org.springframework.boot.actuate.health.AbstractHealthIndicator.health: 89] - Mail health check failed
javax.mail.MessagingException: Could not connect to SMTP host: smtp.qiye.aliyun.com, port: 465, response: -1
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2197) ~[javax.mail-1.6.2.jar:1.6.2]
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740) ~[javax.mail-1.6.2.jar:1.6.2]
    at javax.mail.Service.connect(Service.java:366) ~[javax.mail-api-1.6.2.jar:1.6.2]
    at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:517) ~[spring-context-support-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.mail.javamail.JavaMailSenderImpl.testConnection(JavaMailSenderImpl.java:397) ~[spring-context-support-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.boot.actuate.mail.MailHealthIndicator.doHealthCheck(MailHealthIndicator.java:43) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:84) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.actuate.health.CompositeHealthIndicator.health(CompositeHealthIndicator.java:98) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.actuate.health.HealthEndpoint.health(HealthEndpoint.java:50) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:246) ~[spring-core-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.boot.actuate.endpoint.invoke.reflect.ReflectiveOperationInvoker.invoke(ReflectiveOperationInvoker.java:76) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation.invoke(AbstractDiscoveredOperation.java:61) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.actuate.endpoint.jmx.EndpointMBean.invoke(EndpointMBean.java:126) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at org.springframework.boot.actuate.endpoint.jmx.EndpointMBean.invoke(EndpointMBean.java:99) ~[spring-boot-actuator-2.1.3.RELEASE.jar:2.1.3.RELEASE]
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) ~[?:1.8.0_152]
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) ~[?:1.8.0_152]
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) ~[?:1.8.0_152]
    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) ~[?:1.8.0_152]
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) ~[?:1.8.0_152]
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) ~[?:1.8.0_152]
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) ~[?:1.8.0_152]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) ~[?:1.8.0_152]
    at sun.rmi.transport.Transport$1.run(Transport.java:200) ~[?:1.8.0_152]
    at sun.rmi.transport.Transport$1.run(Transport.java:197) ~[?:1.8.0_152]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_152]
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[?:1.8.0_152]
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) ~[?:1.8.0_152]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) ~[?:1.8.0_152]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) ~[?:1.8.0_152]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_152]
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) [?:1.8.0_152]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_152]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_152]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_152]

这个错误可以明显看出是springboot的健康检测报的错误，报错的原因是配置参数缺少导致的，原来的配置如下：  

spring:
  mail:
    host: smtp.mxhichina.com
    port: 465
    username: notice@lvzaimo.com
    password: Not@lzm.m3
    properties:
      mail:
        smtp:
          auth: true
          ssl:
            enabled: true
          starttls:
            enabled: true
            required: true
    default-encoding: UTF-8

修改后的配置：

spring:
  mail:
    host: smtp.mxhichina.com
    port: 465
    username: notice@lvzaimo.com
    password: Not@lzm.m3
    properties:
      mail:
        smtp:
          auth: true
          ssl:
            enabled: true
          starttls:
            enabled: true
            required: true
          socketFactory:
            port: 465
            class: javax.net.ssl.SSLSocketFactory
            fallback: false
    default-encoding: UTF-8

增加了以下几个配置：

socketFactory:
  port: 465
  class: javax.net.ssl.SSLSocketFactory
  fallback: false