Sending emails over SMTP with TSL
The code posted below works fine for me to send an email over an STMP with SSL. Now the SMTP changed to TSL and i dont manage to send email with it. I tried several things like adding
props.put("mail.smtp.starttls.enable","true");
but it was no use.
The error code says:
"javax.mail.MessagingException: Could not connect to SMTP host: exch.studi.fhws.de, port: 587; nested exception is: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?"
Any ideas?
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public class SendMail
{
String d_email = "...",
password = "...",
host = "...",
port = "25",
mailTo = "...",
mailSubject = "test",
mailText = "test";
public SendMail()
{
Properties props = new Properties();
props.put("mail.smtp.user", d_email);
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", port);
props.put("mail.smtp开发者_如何学运维.starttls.enable","true");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.socketFactory.port", port);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
SecurityManager security = System.getSecurityManager();
try
{
Authenticator auth = new SMTPAuthenticator();
Session session = Session.getInstance(props, auth);
MimeMessage msg = new MimeMessage(session);
msg.setText(mailText);
msg.setSubject(mailSubject);
msg.setFrom(new InternetAddress(d_email));
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
Transport.send(msg);
}
catch (Exception mex)
{
mex.printStackTrace();
}
}
public static void main(String[] args)
{
TextClass tc = new TextClass();
}
private class SMTPAuthenticator extends javax.mail.Authenticator
{
public PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(d_email, password);
}
}
}
The error message says you're connecting to port 587 - this is an SSL-enabled email port, which means the connection has to be SSL from the get-go. Your code is connecting via plaintext (e.g. plain port 25) and THEN attempting to start TLS. This won't work, as port 587 expects an SSL exchange immediately, not a "EHLO ... / STARTTLS" plaintext command set.
Maybe this answer, talking about Exchange servers with SMTP ports disabled, is useful: https://stackoverflow.com/a/12631772/187148
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