发邮件已经是老生常谈了，今天又遇到了，而且又出了各种问题。我晕哦。

我的配置是：

spring.mail.host=smtp..com

spring.mail.username=klxxxx

spring.mail.password=qwer1234

spring.boot.admin.notify.mail.to=lkxxx@qq.com

出现了553：

-- ::21.022  WARN  --- [ctor-http-nio-] d.c.b.a.s.notify.NotificationTrigger     : Unexpected error while handling null

org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException:  Mail from must equal authorized user

;

  nested exception is:

    com.sun.mail.smtp.SMTPSenderFailedException:  Mail from must equal authorized user

    at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:) ~[spring-context-support-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:) ~[spring-context-support-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:) ~[spring-context-support-5.1..RELEASE.jar:5.1..RELEASE]

    at de.codecentric.boot.admin.server.notify.MailNotifier.lambda$doNotify$(MailNotifier.java:) ~[spring-boot-admin-server-2.1..jar:2.1.]

    at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:) [reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxFilter$FilterSubscriber.onNext(FluxFilter.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxFilter$FilterSubscriber.request(FluxFilter.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:) [reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxFilter$FilterSubscriber.onSubscribe(FluxFilter.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFilter.subscribe(MonoFilter.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Mono.subscribe(Mono.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoIgnorePublisher.subscribe(MonoIgnorePublisher.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Mono.subscribe(Mono.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Mono.subscribe(Mono.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxFlatMap$FlatMapMain.onNext(FluxFlatMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxSubscribeOn$SubscribeOnSubscriber.onNext(FluxSubscribeOn.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxFilter$FilterSubscriber.onNext(FluxFilter.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPeekFuseable$PeekConditionalSubscriber.onNext(FluxPeekFuseable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPublish$PublishSubscriber.drain(FluxPublish.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPublish$PublishSubscriber.onNext(FluxPublish.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.UnicastProcessor.drainFused(UnicastProcessor.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.UnicastProcessor.drain(UnicastProcessor.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.UnicastProcessor.onNext(UnicastProcessor.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxCreate$IgnoreSink.next(FluxCreate.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxCreate$SerializedSink.next(FluxCreate.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at de.codecentric.boot.admin.server.eventstore.InstanceEventPublisher.lambda$publish$(InstanceEventPublisher.java:) ~[spring-boot-admin-server-2.1..jar:2.1.]

    at java.util.ArrayList.forEach(ArrayList.java:) ~[na:1.8.0_131]

    at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:) ~[na:1.8.0_131]

    at de.codecentric.boot.admin.server.eventstore.InstanceEventPublisher.publish(InstanceEventPublisher.java:) ~[spring-boot-admin-server-2.1..jar:2.1.]

    at de.codecentric.boot.admin.server.eventstore.InMemoryEventStore.lambda$append$(InMemoryEventStore.java:) ~[spring-boot-admin-server-2.1..jar:2.1.]

    at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:) [reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Mono.subscribe(Mono.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onError(FluxOnErrorResume.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onError(FluxPeekFuseable.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onError(MonoFlatMap.java:) [reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPeek$PeekSubscriber.onError(FluxPeek.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onError(Operators.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondError(MonoFlatMap.java:) [reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onError(MonoFlatMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onError(MonoFlatMap.java:) [reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxRetry$RetrySubscriber.onError(FluxRetry.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxMap$MapSubscriber.onError(FluxMap.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPeek$PeekSubscriber.onError(FluxPeek.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxPeek$PeekSubscriber.onError(FluxPeek.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoNext$NextSubscriber.onError(MonoNext.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoFlatMapMany$FlatMapManyMain.onError(MonoFlatMapMany.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.FluxRetryPredicate$RetryPredicateSubscriber.onError(FluxRetryPredicate.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.core.publisher.MonoCreate$DefaultMonoSink.error(MonoCreate.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.netty.http.client.HttpClientConnect$MonoHttpConnect$TcpClientSubscriber.onError(HttpClientConnect.java:) ~[reactor-netty-0.8..RELEASE.jar:0.8..RELEASE]

    at reactor.core.publisher.MonoCreate$DefaultMonoSink.error(MonoCreate.java:) ~[reactor-core-3.2..RELEASE.jar:3.2..RELEASE]

    at reactor.netty.resources.PooledConnectionProvider$DisposableAcquire.operationComplete(PooledConnectionProvider.java:) ~[reactor-netty-0.8..RELEASE.jar:0.8..RELEASE]

    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.channel.pool.SimpleChannelPool.notifyConnect(SimpleChannelPool.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.pool.SimpleChannelPool.access$(SimpleChannelPool.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.pool.SimpleChannelPool$.operationComplete(SimpleChannelPool.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.pool.SimpleChannelPool$.operationComplete(SimpleChannelPool.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:) ~[netty-transport-4.1..Final.jar:4.1..Final]

    at io.netty.util.concurrent.SingleThreadEventExecutor$.run(SingleThreadEventExecutor.java:) ~[netty-common-4.1..Final.jar:4.1..Final]

    at java.lang.Thread.run(Thread.java:) ~[na:1.8.0_131]

难道是密码错误吗？ 仔细确认，密码是没错的。

故意把密码设置错误，得到另外一个异常： Caused by: javax.mail.AuthenticationFailedException: 535 Error: authentication failed

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.

-- ::52.452 ERROR  --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Mail server is not available

    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$(AbstractBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:) ~[spring-context-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:) ~[spring-context-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:) ~[spring-boot-2.1..RELEASE.jar:2.1..RELEASE]

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:) [spring-boot-2.1..RELEASE.jar:2.1..RELEASE]

    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:) [spring-boot-2.1..RELEASE.jar:2.1..RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:) [spring-boot-2.1..RELEASE.jar:2.1..RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:) [spring-boot-2.1..RELEASE.jar:2.1..RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:) [spring-boot-2.1..RELEASE.jar:2.1..RELEASE]

    at com.lk.DemoSpringbootAdminApplication.main(DemoSpringbootAdminApplication.java:) [classes/:na]

Caused by: java.lang.IllegalStateException: Mail server is not available

    at org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration.validateConnection(MailSenderValidatorAutoConfiguration.java:) ~[spring-boot-autoconfigure-2.1..RELEASE.jar:2.1..RELEASE]

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:) ~[na:1.8.0_131]

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:) ~[na:1.8.0_131]

    at java.lang.reflect.Method.invoke(Method.java:) ~[na:1.8.0_131]

    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:) ~[spring-beans-5.1..RELEASE.jar:5.1..RELEASE]

    ...  common frames omitted

Caused by: javax.mail.AuthenticationFailedException:  Error: authentication failed

    at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:) ~[javax.mail-1.6..jar:1.6.]

    at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:) ~[javax.mail-1.6..jar:1.6.]

    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:) ~[javax.mail-1.6..jar:1.6.]

    at javax.mail.Service.connect(Service.java:) ~[javax.mail-1.6..jar:1.6.]

    at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:) ~[spring-context-support-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.mail.javamail.JavaMailSenderImpl.testConnection(JavaMailSenderImpl.java:) ~[spring-context-support-5.1..RELEASE.jar:5.1..RELEASE]

    at org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration.validateConnection(MailSenderValidatorAutoConfiguration.java:) ~[spring-boot-autoconfigure-2.1..RELEASE.jar:2.1..RELEASE]

    ...  common frames omitted

密码错误确实会出现553，但是具体原因是不同的。可见， 密码是没问题的。

需要一个授权码？ 我记得163邮箱是挺好用的。qq邮箱需要授权码， 163好像不需要的吧。。

难道需要额外配置：

spring.mail.protocol=smtp

spring.mail.properties.mail.smtp.auth=true

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

spring.mail.test-connection=true

加上了，然并卵。

这坑爹啊。。 查看所有可用的配置，偶然看到了一个配置 spring.boot.admin.notify.mail.from，设置一下吧， 同 spring.mail.username=klxxxx 一样的。 重启， 好了！

参考

https://www.cnblogs.com/xibei666/p/9016593.html

https://blog.csdn.net/sun2015_07_24/article/details/52074898

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