java - How to send multiple emails in one session? -


i want send thousands of different emails different recipients , open connection smtp , hold it. hope faster reopen connection ervy mail. use apache commons email that, fall java mail api if necessary.

right i'am doing this, opens closes connection every time:

htmlemail email = new htmlemail(); email.sethostname(server.gethostname()); email.setsmtpport(server.getport()); email.setauthenticator(new defaultauthenticator(server.getusername(), server.getpassword())); email.settls(true); email.setfrom("test@example.com"); email.addto(to); email.setsubject(subject); email.sethtmlmsg(htmlmsg); email.send();

here performance test class. sending mails using 1 connection 4 times faster reopen connection every time (what happens when use commons mail). performance can pushed further using multiple threads.

    properties properties = system.getproperties();     properties.put("mail.smtp.host", server);     properties.put("mail.smtp.port", "" + port);      session session = session.getinstance(properties);     transport transport = session.gettransport("smtp");      transport.connect(server, username, password);      (int = 0; < count; i++) {          message message = new mimemessage(session);         message.setfrom(new internetaddress(from));         internetaddress[] address = {new internetaddress(to)};         message.setrecipients(message.recipienttype.to, address);          message.setsubject(subject + "javamail api");         message.setsentdate(new date());          sethtmlcontent(message);         message.savechanges();         transport.sendmessage(message, address);      }      transport.close();

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