javax.mail.MessagingException: Could not convert socket to TLS

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Error code

javax.mail.MessagingException: Could not convert socket to TLS;

nested exception is: PKIX path building failed: unable to find valid certification path to requested target

First of all, Youdao looks like a certificate problem after translation. Then Baidu took a look. See a lot of people encounter these problems, try one by one

The original way to get SMTP

Properties props = new Properties();
props.put(“”, host);
props.put(“mail.smtp.starttls.enable”, “true”);
props.put(“mail.smtp.auth”, “true”);

Session session = Session.getDefaultInstance(props);

Later try to add the code (host is the address of the mailbox server), you can send it. The general meaning on the Internet is that the setting service can be trusted and does not need a security certificate

props.put(“”, host);

If not, it is possible to call SSL encryption and search on the Internet how to send SSL encrypted e-mail

Or try another way to create a session

Session session = Session.getInstance(props, new javax.mail.Authenticator()
{ protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password); } }

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