使用 JavaMail 发送邮件时出现 javax.net.ssl.SSLException
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javax.net.ssl.SSLException when sending mail using JavaMail
提问by Rajesh Kumar J
javax.mail.MessagingException: Exception reading response;
nested exception is:
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1764)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1523)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:453)
at javax.mail.Service.connect(Service.java:313)
at javax.mail.Service.connect(Service.java:172)
at javax.mail.Service.connect(Service.java:121)
at javax.mail.Transport.send0(Transport.java:190)
at javax.mail.Transport.send(Transport.java:120)
at javaapplication5.SendMail.send(SendMail.java:77)
at javaapplication5.SendMailTest.main(SendMailTest.java:17)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.net.ssl.internal.ssl.InputRecord.handleUnknownRecord(InputRecord.java:523)
at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:355)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:789)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1112)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:744)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:75)
at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:106)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:84)
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1742)
... 9 more
Can anybody help me to send a mail using JavaMail API using proxy?
有人可以帮助我使用 JavaMail API 使用代理发送邮件吗？
回答by Thorbj?rn Ravn Andersen
You are trying to do an SSL connection to a non-SSL port. This will not work.
您正在尝试与非 SSL 端口建立 SSL 连接。这是行不通的。
If you want to send mail through gmail, see the FAQ: http://java.sun.com/products/javamail/FAQ.html#gmail
如果您想通过 gmail 发送邮件，请参阅常见问题解答：http: //java.sun.com/products/javamail/FAQ.html#gmail
回答by BungleFeet
I was getting the same exception when trying to send email via the Hotmail SMTP server at smtp.live.com. Here are the settings that worked for me in the end:
尝试通过 smtp.live.com 上的 Hotmail SMTP 服务器发送电子邮件时，我遇到了同样的异常。以下是最终对我有用的设置：
mail.smtp.starttls.enable=true
mail.smtp.port=587
回答by Erich
If you don't want to use SSL, and you're using smtp instead of smtps try these settings
如果您不想使用 SSL，并且您使用的是 smtp 而不是 smtps，请尝试这些设置
mail.smtp.starttls.enable=false
mail.transport.protocol=smtp
回答by Sheepy
As Andersen answered, doing an SSL connection (mail.smtp.ssl.enable=true) to a non-SSL port will throw this error.
正如 Andersen 回答的那样，mail.smtp.ssl.enable=true对非 SSL 端口进行 SSL 连接 ( ) 将引发此错误。
This is commonly caused by connecting to the wrong port, as many popular mail services use port 587 instead of default smtps port 465. This applies to GMail, Hotmail/Live Mail, and Yahoo Mail.
这通常是由于连接到错误的端口造成的，因为许多流行的邮件服务使用端口 587 而不是默认的 smtps 端口 465。这适用于GMail、Hotmail/Live Mail和Yahoo Mail。
My problem, however, is that Java Mail insists on using SSL even when I set ssl to false.
然而，我的问题是，即使我将 ssl 设置为 false，Java Mail 也坚持使用 SSL。
After tracing the source code, the problem is I used Session.getDefaultInstance, copied from some example code.
It only creates a session with the given properties on the first call; subsequence calls will return that old session, instead of a new session.
追查源代码后，问题是我用的Session.getDefaultInstance，从一些示例代码中复制过来的。它只在第一次调用时创建一个具有给定属性的会话；子序列调用将返回旧会话，而不是新会话。
Switching to Session.getInstancemake sure it use the properties I pass in, and solved my "SSLException: Unrecognized SSL message".
切换以Session.getInstance确保它使用我传入的属性，并解决了我的“SSLException：无法识别的 SSL 消息”。
回答by Jose1755
I was facing this problem when using Gmail.
我在使用 Gmail 时遇到了这个问题。
In order to use Gmail I had to turn ON "Allow less secure apps".
为了使用 Gmail，我必须打开“允许安全性较低的应用程序”。
This Gmail setting can be found at https://www.google.com/settings/security/lesssecureappsafter login the gmail account.
登录 Gmail 帐户后，可以在https://www.google.com/settings/security/lesssecureapps上找到此 Gmail 设置。
