java - Email is sending but not receiving when use no authentication -


i sending email using

public void sendemail(string fromemailaddr, string toemailaddr,string subject, string emailbody) {        string host = "xxx";         final string user = "user";     final string password = "password";      // system properties     properties properties = new properties();      // setup mail server      properties.put("mail.smtp.host", host);      properties.put("mail.smtp.port", "25");        // default session object.      session session = session.getdefaultinstance(properties, null);      try{          // create default mimemessage object.          mimemessage message = new mimemessage(session);           // set from: header field of header.          message.setfrom(new internetaddress(fromemailaddr));           // set to: header field of header.          message.addrecipient(message.recipienttype.to, new internetaddress(toemailaddr));           // set subject: header field          message.setsubject(subject);           // set actual message          message.settext(emailbody);           // send message          transport.send(message);          system.out.println("sent message successfully....");       }catch (messagingexception mex) {          mex.printstacktrace();       } }

when try send email using above code comes message sent message successfully.... got no email. on other hand if use authentication got email

properties.put("mail.smtp.host", host); properties.put("mail.smtp.auth", "true");   session session = session.getdefaultinstance(properties,         new javax.mail.authenticator() {                 protected passwordauthentication getpasswordauthentication() {                     return new passwordauthentication(user,password);                 }         });

why ? necessary provide username , password host ? can send email specifying host, no username , password provided ?

thanks

i guess port number might issue.

try changing properties.put("mail.smtp.port", "25");

to properties.put("mail.smtp.port", "587");.

further can refer this.


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