Error in sending test mail at Hudson Email Notifications

I could successfully send e-mail notification in Hudson using gmail as the smtp server. But when I try to configure our own smtp server, it gives the following error when trying开发者_StackOverflow中文版 to send the test mail:

Failed to send out e-mail

javax.mail.MessagingException: Exception reading response;
  nested exception is:
        javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

Are there any special configurations with the e-mail notifications???

Edit:

Also does it require enforcing the security certificate and if so is there a way to achieve it???

Thanks

Please try using the following settings:

SMTP SERVER : smtp.gmail.com
use SMTP Authentication : true
use SSL : true
SMTP port : 465

I had this problem too. My solution was to make all the necessary configuration (check ssl box and stuff) and CLICK THE SAVE BUTTON before use the test mail.

i just had this issue before clicking the save button.

Changing the SMTP port from 587 to 465 also resolved this issue for me, even though I'm using an alternative SMTP service:

SMTP server:               smtp.mandrill.com
Use SMTP Authentication:   true
Use SSL:                   true
SMTP Port:                 465

From what I can tell (disclaimer: I am by no means a Hudson/Jenkins expert) the Hudson/Jenkins email plugin supports SSL encrypted SMTP communication - however this implementation requires that communications are encrypted from the get go.

When connecting on port 587, the server on the other end may expect a STARTTLS command (see this SSL vs TLS vs STARTTLS article). This command is sent using plain-text to 'upgrade' the connection to use SSL/TLS.

Hudson/Jenkins instead attempts to start negotiating SSL on port 587, which is promptly rejected, resulting in the following error:

javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

I also tried adding additional JAVA options "-Dmail.smtp.starttls.enable=true" (configured in /etc/default/jenkins on Unbuntu) to enable TLS:

JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Dmail.smtp.starttls.enable=true"

Unfortunately this didn't resolve the issue for me.

After changing the port to 465, the SSL negotiation occurred correctly and the communication succeeded.

Hope that helps.