Susie Susie - 1 month ago 21
Java Question

MailConnectException while sending mail using java mail api

Trying to send an email using java mail api. And I keep getting MailConnectException. I have tried multiple ways to solve it without success.

Exception is thrown by this statement

transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword");


Can anyone tell me what I'm doing wrong?

public static void main(String[] args) {
String host = "smtp.gmail.com";
String from = "someone@gmail.com";
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", "myPassword");
props.put("mail.smtp.port", "465");
props.put("mail.smtp.auth", "true");
try{
Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.addRecipients(Message.RecipientType.TO, "someone@hotmail.com");
message.setSubject("sending in a group");
message.setText("Welcome to JavaMail");
Transport transport = session.getTransport("smtp");
transport.connect("smtp.gmail.com", "someone@gmail.com", "myPassword");//CAUSES EXCEPTION
transport.sendMessage(message, message.getAllRecipients());
}catch(MessagingException e){
e.printStackTrace();
}
}


Stack trace:

com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
nested exception is:
java.net.ConnectException: Connection timed out: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1984)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:656)
at javax.mail.Service.connect(Service.java:345)
at javax.mail.Service.connect(Service.java:226)
at com.karmacrafts.util.CustomEmail.main(CustomEmail.java:127)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:301)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1950)
... 4 more

Answer

This looks like network problem. Even though it could occur due to variety of reasons, like :-

"Couldn't connect to host, port" could be caused by wrong host name, wrong port, a blocking firewall (on the server, on gateways, even on your own machine), network failure, server downtime, etc.

Can you connect to the mail server using telnet ?

Also see this FAQ for some mistakes you committed http://www.oracle.com/technetwork/java/javamail/faq/index.html#commonmistakes

Read this answer on how to send emails using gmail http://stackoverflow.com/a/47452/3107043

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