java - Could not connect to SMTP host -

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i trying send email via our private smtp server here code 

  public static void main(string args[]) throws messagingexception {   properties props = system.getproperties();         props.put("mail.smtps.host", "gi-systems.net");         props.put("mail.smtps.auth", "true");         props.put("mail.smtp.starttls.enable", "true");         props.put("mail.smtp.port", "25");         session session = session.getinstance(props, null);         message msg = new mimemessage(session);         msg.setfrom(new internetaddress("xxxx@gi-systems.net"));         msg.setrecipients(message.recipienttype.to,                 internetaddress.parse("yyyy@hotmail.com, false));         msg.setsubject("password recovery");         msg.settext(pwd);         msg.setsentdate(new date());         smtptransport t = (smtptransport) session.gettransport("smtps");         t.connect("smtp.gi-systems.net", "xxxx@gi-systems.net", "mypassword");         t.sendmessage(msg, msg.getallrecipients());         system.out.println("response: " + t.getlastserverresponse());         t.close(); }

but when run code got exception

exception in thread "main" javax.mail.messagingexception: not connect smtp host: smtp.gi-systems.net, port: 465;   nested exception is:     javax.net.ssl.sslhandshakeexception: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ com.sun.mail.smtp.smtptransport.openserver(smtptransport.java:1706)     @ com.sun.mail.smtp.smtptransport.protocolconnect(smtptransport.java:525)     @ javax.mail.service.connect(service.java:291)     @ javax.mail.service.connect(service.java:172)     @ com.mycompany.sendmail.app.sendemail(app.java:45)     @ com.mycompany.sendmail.app.main(app.java:64) caused by: javax.net.ssl.sslhandshakeexception: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable find valid certification path requested target     @ sun.security.ssl.alerts.getsslexception(alerts.java:192)     @ sun.security.ssl.sslsocketimpl.fatal(sslsocketimpl.java:1886) ......

ps: when use gmail smtp , email address works fine

how can fix exception???

check following things:

for example gmail.

1.

t.connect("smtp.gmail.com", "mailid", "password");

2.properties:

props.put("mail.smtp.auth", "true"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.smtp.host", "smtp.gmail.com");  //for gmail 'smtp.gmail.com' check yours                props.put("mail.smtp.port","587");//or port 465

please check case.

it seems wrong setting properties or authentication.


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