Need Help for TLS connection mail sending

Question

Hi All,
I am getting the below exception when i try to send an email through a secure connection.
I am setting these properties while setting up a session with the server.
props.put("mail.smtp.host", host);
final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
props.setProperty
+( "mail.smtp.socketFactory.class",SSL_FACTORY);+
props.setProperty("mail.smtp.socketFactory.fallback","false");
props.setProperty("mail.smtp.starttls.enable","true");
Session session = Session.getInstance(props, null);
The Exception trace is below..
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: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:288)
at javax.mail.Service.connect(Service.java:169)
at javax.mail.Service.connect(Service.java:118)
at javax.mail.Transport.send0(Transport.java:188)
at javax.mail.Transport.send(Transport.java:118)
at com.rbc.yag0.dbload.script.SMTPEmailDelivery.main(SMTPEmailDelivery.java:105)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.ibm.jsse2.a.c(Unknown Source)
at com.ibm.jsse2.a.a(Unknown Source)
at com.ibm.jsse2.by.a(Unknown Source)
at com.ibm.jsse2.by.l(Unknown Source)
at com.ibm.jsse2.by.a(Unknown Source)
at com.ibm.jsse2.c.read(Unknown Source)
at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:200)
at java.io.BufferedInputStream.read(BufferedInputStream.java:218)
at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java(Compiled Code))
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1589)
... 8 more
I would like to know the below
1. reason for the above exception.
2.Are there any other properties which needs to set.
3. Is there any dependency on the Server Certificate.
I would appreciate a response for any of the above.
(However i will be expecting answers for all :) )

Answer 1

I really wish I could get google to stop returning
this code that uses socket factories. It just
makes it more difficult for people.
And I really wish I could get people to read the
instructions that come with JavaMail.
I just don't understand why the text in the
exception message doesn't seem to be a clue
that anyone can understand. It says:
"Unrecognized SSL message, plaintext connection?"
Decoding that, what it's trying to tell you is that
it was expecting to get an SSL message,
but it got something it didn't recognize, and
perhaps that's because you connected on a
port that's using plain text instead of SSL.
It appears that you're trying to connect on
the normal (plain text) SMTP port, and then
use the STARTTLS command to switch the
connection into SSL mode. That's a good
thing to do, but you're doing it wrong.
Remove all the socket factory properties and
it should work. The socket factory properties
are forcing it to make an SSL connection at
first, which is not what the server is expecting.
If it still doesn't work, please read SSLNOTES.txt
and the JavaMail FAQ.