雅加达邮件：无法验证服务器身份

问：

我正在尝试在Spring Boot应用程序中发送电子邮件并出现此异常

org.springframework.mail.MailSendException: Mail server connection failed. Failed messages: jakarta.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
    java.io.IOException: Can't verify identity of server: example.com; message exceptions (1) are:
Failed message 1: jakarta.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
    java.io.IOException: Can't verify identity of server: 

我已经尝试了 SO 的几个答案，我的配置如下所示：

spring.mail.host=example.com
spring.mail.port=587
[email protected]
spring.mail.password=7Wdz@o75
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.ssl.trust=example.com
spring.mail.properties.mail.smtp.ssl.protocols=TLSv1.2

任何帮助都是值得赞赏的。

当我运行它时，我看到：-Djavax.net.debug=ssl

javax.net.ssl|DEBUG|91|http-nio-8081-exec-4|2023-08-30 11:47:15.614 CEST|null:-1|jdk.tls.keyLimits:  entry = AES/GCM/NoPadding KeyUpdate 2^37. AES/GCM/NOPADDING:KEYUPDATE = 137438953472
javax.net.ssl|DEBUG|91|http-nio-8081-exec-4|2023-08-30 11:47:15.778 CEST|null:-1|duplex close of SSLSocket
javax.net.ssl|DEBUG|91|http-nio-8081-exec-4|2023-08-30 11:47:15.779 CEST|null:-1|close the underlying socket
javax.net.ssl|DEBUG|91|http-nio-8081-exec-4|2023-08-30 11:47:15.779 CEST|null:-1|close the SSL connection (initiative)
javax.net.ssl|DEBUG|91|http-nio-8081-exec-4|2023-08-30 11:47:15.780 CEST|null:-1|close inbound of SSLSocket
javax.net.ssl|WARNING|91|http-nio-8081-exec-4|2023-08-30 11:47:15.783 CEST|null:-1|SSLSocket duplex close failed. Debug info only. Exception details: (
"throwable" : {
  java.net.SocketException: Socket is closed
    at java.base/java.net.Socket.shutdownInput(Unknown Source)
    at java.base/sun.security.ssl.BaseSSLSocketImpl.shutdownInput(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketImpl.shutdownInput(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketImpl.bruteForceCloseInput(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketImpl.duplexCloseOutput(Unknown Source)
    at java.base/sun.security.ssl.SSLSocketImpl.close(Unknown Source)
    at com.sun.mail.util.SocketFetcher.checkServerIdentity(SocketFetcher.java:698)
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:636)
    at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:555)
    at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2184)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:766)
    at jakarta.mail.Service.connect(Service.java:342)
    at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:518)