Search code examples
javasslsmtpjakarta-mailpostfix-mta

Sending SMTP Mail via Java and Postfix Server

I am trying to send smtp mail by using java. My Mail codes:

    Properties properties = System.getProperties();
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.starttls.enable","true");
    properties.put("mail.smtp.host", "example.com");
    properties.put("mail.smtp.port", "587");
    properties.put("mail.smtp.user", "webmaster@example.com");
    properties.put("mail.smtp.password", "123456");

    Authenticator auth = new Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication("webmaster@example.com","123456");
        }
    };

    Session mailSession = Session.getInstance(properties, auth);
    mailSession.setDebug(true);
    Transport transport = mailSession.getTransport("smtp");

example.com is my postfix server host name.

I have created my server exacly same steps in this LINK: http://cnedelcu.blogspot.com.tr/2014/01/how-to-set-up-simple-mail-server-debian-linux.html

and i get that java error:

DEBUG: setDebug: JavaMail version 1.4ea
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "example.com", port 587, isSSL false
220 example.com ESMTP Postfix (Debian/GNU)
DEBUG SMTP: connected to host "example.com", port: 587

EHLO VGate
250-example.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "SIZE", arg "10240000"
DEBUG SMTP: Found extension "VRFY", arg ""
DEBUG SMTP: Found extension "ETRN", arg ""
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "DSN", arg ""
STARTTLS
220 2.0.0 Ready to start TLS
EHLO VGate
14:41:49,841 ERROR SystemUsers:253 - Unknown System ErrSor at REST Service
javax.mail.MessagingException: Can't send command to SMTP host;
  nested exception is:
        javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:1420)
        at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:1408)
        at com.sun.mail.smtp.SMTPTransport.ehlo(SMTPTransport.java:847)
        at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:384)
        at javax.mail.Service.connect(Service.java:275)
        at javax.mail.Service.connect(Service.java:156)

Also here is my mail logs:

Mar  2 14:43:12 VGate postfix/smtpd[28565]: connect from localhost[127.0.0.1]
Mar  2 14:43:12 VGate postfix/smtpd[28565]: SSL_accept error from localhost[127.0.0.1]: 0
Mar  2 14:43:12 VGate postfix/smtpd[28565]: warning: TLS library problem: error:14094416:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate unknown:s3_pkt.c:1294:SSL alert number 46:
Mar  2 14:43:12 VGate postfix/smtpd[28565]: lost connection after STARTTLS from localhost[127.0.0.1]
Mar  2 14:43:12 VGate postfix/smtpd[28565]: disconnect from localhost[127.0.0.1]

What should i do to get over that errors.

Thanks for helping.

Solution

  • Your JavaMail implementation is giving you error, because it says that it cannot find a trusted (or signed by a trusted CA) certificate. In order to fix it, you must use the "keytool" in your java installation and add your server's certificate to the trusted certificates list:

    keytool -import -alias <some alias> -file <your certificate>.cer -keystore cacerts