如何用java mail解决“该域需要进行TLS”

Question

我有一个非常简单的任务。从Spring启动应用程序发送一封电子邮件。配置很简单。

spring:
  mail:
    host: <our host>
    username: <our user name>
    password: <the password>
    port: 587
    properties:
      mail:
        debug: true
        smtp:
          auth: true
          ssl:
            protocols: TLSv1.2
          starttls:
            enabled: true

我针对Hetzner和Gmail测试了Java Mail的标准实现，它可以正常工作。

使用T-Systems SMTP服务器，我们看到一个错误。

DEBUG: Jakarta Mail version 1.6.7
DEBUG: successfully loaded resource: /META-INF/javamail.default.providers
DEBUG: Tables of loaded providers
DEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle]}
DEBUG: Providers Listed By Protocol: {imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "the-smtp-server", port 587, isSSL false
220 the-smtp-server ESMTP
DEBUG SMTP: connected to host "the-smtp-server", port: 587
EHLO comstar-backend-deployment-584b9b68d8-crb7p
250-the-smtp-server Hello comstar-backend-deployment-584b9b68d8-crb7p [10.55.238.32]
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-PIPE_CONNECT
250-AUTH LOGIN
250-CHUNKING
250-STARTTLS
250 HELP
DEBUG SMTP: Found extension "SIZE", arg "52428800"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "PIPE_CONNECT", arg ""
DEBUG SMTP: Found extension "AUTH", arg "LOGIN"
DEBUG SMTP: Found extension "CHUNKING", arg ""
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "HELP", arg ""
DEBUG SMTP: protocolConnect login, host=the-smtp-server, user=<username>, password=<non-null>
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM XOAUTH2 
DEBUG SMTP: Using mechanism LOGIN
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded
DEBUG SMTP: use8bit false
MAIL FROM:<...>
250 OK
RCPT TO:<...>
550 TLS required to proceed for this domain
RCPT TO:<...>
550 TLS required to proceed for this domain
DEBUG SMTP: Invalid Addresses
DEBUG SMTP:   ...
DEBUG SMTP:   ...
DEBUG SMTP: Sending failed because of invalid destination addresses
RSET
250 Reset OK
DEBUG SMTP: MessagingException while sending, THROW: 
javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
    com.sun.mail.smtp.SMTPAddressFailedException: 550 TLS required to proceed for this domain

知道我能做些什么来找出这个问题吗？

如何查看使用的密码？

Answer 1

这个配置解决了这个问题

spring:
  mail:
    host: <our host>
    port: 587
    properties:
      mail:
        debug: true
        smtp:
          starttls:
            enabled: true
            required: true

我不明白为什么服务器和客户机之间不协商这个问题，因为他们似乎都知道TLS<相反，您必须将starttls设置为required
不需要调试配置，在我们的情况下也不需要身份验证，因为流量是内部路由的。。。