Unrecognized SSL message, plaintext connection?

最新推荐文章于 2025-07-02 13:39:35 发布

Foolish_nick

最新推荐文章于 2025-07-02 13:39:35 发布

阅读量5.3k

点赞数

CC 4.0 BY-SA版权

分类专栏： java Utils 文章标签： javaMail

本文链接：https://blog.youkuaiyun.com/qq_20867981/article/details/80081106

Utils 同时被 2 个专栏收录

18 篇文章

订阅专栏

java

14 篇文章

订阅专栏

本文介绍了一种javax.mail.MessagingException异常的解决方案，该异常通常出现在使用Java Mail API通过SMTP发送邮件时遇到SSL握手失败的情况。异常的根本原因是尝试使用不支持SSL的SMTP连接进行加密通信。文章提供了将SMTP连接更改为支持SSL的smtps方案来解决问题的方法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

异常：

javax.mail.MessagingException: Exception reading response (javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?)
	at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1611)
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1369)
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
	at javax.mail.Service.connect(Service.java:248)
	at javax.mail.Service.connect(Service.java:91)
	at com.sa.util.EmailUtil.sendMail(EmailUtil.java:87)
	at com.sa.mobile.controller.MobileController.send2Email2(MobileController.java:588)
	at com.sa.mobile.controller.MobileController.main(MobileController.java:49)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
	at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:710)
	at sun.security.ssl.InputRecord.read(InputRecord.java:527)
	at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973)
	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
	at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:928)
	at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)
	at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
	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:88)
	at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1589)
	... 7 more

解决方式:

props.setProperty("mail.transport.protocol", "smtp");

改为：

props.setProperty("mail.transport.protocol", "smtps");