Java Mail Api 拋出 MessagingException：異常讀取響應

Question

我正在嘗試使用 localhost 和 Java Mail Api 發送郵件，但是在發送郵件時會生成異常

Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:47)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:86)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
Caused by: javax.mail.MessagingException: Exception reading response;
  nested exception is:
    java.net.SocketTimeoutException: Read timed out
    at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2202)
    at com.sun.mail.smtp.SMTPTransport.close(SMTPTransport.java:1212)
    at javax.mail.Transport.send0(Transport.java:257)
    at javax.mail.Transport.send(Transport.java:124)
    at com.monoplus.mcd.JavaMailApi.sendMail(JavaMailApi.java:87)
    at com.monoplus.mcd.SendMailMain.main(SendMailMain.java:18)
    ... 8 more
Caused by: java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
    at java.net.SocketInputStream.read(SocketInputStream.java:171)
    at java.net.SocketInputStream.read(SocketInputStream.java:141)
    at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:124)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
    at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89)
    at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2182)
    ... 13 more

我的 Postfix 正在運行，它的配置是默認的。

此外，端口 25 處於偵聽狀態

我可以使用telnet localhost 25進行連接

源代碼位於https://bitbucket.org/saavedrah_/javamail/src/master/

謝謝

Answer 1

在我的 build.gradle 中，我引用了這兩個庫

    implementation 'javax.mail:javax.mail-api:1.6.2'
    implementation 'javax.mail:mail:1.5.0-b01'

刪除 javax.mail-api 引用時，郵件發送沒有任何問題。

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