MailConnectException while sending mail using java mail api

Question

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", "[email protected]", "myPassword");

Can anyone tell me what I'm doing wrong?

public static void main(String[] args) { String host = "smtp.gmail.com"; String from = "[email protected]"; 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, "[email protected]"); message.setSubject("sending in a group"); message.setText("Welcome to JavaMail"); Transport transport = session.getTransport("smtp"); transport.connect("smtp.gmail.com", "[email protected]", "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

@Caadi0 Thanks for your comment. But I still get the same error. — Susie
– Susie, Commented Dec 24, 2013 at 21:27

Community · Accepted Answer · 2017-05-23 12:13:41Z

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 https://stackoverflow.com/a/47452/3107043

copy pasted the same code from the gmail link you provided with and I still get the same error.
You were correct about the cause possibly being wrong port number I changed the port number to 587 and added this statement to my above code and it worked fine. props.put("mail.smtp.starttls.enable", "true");

shiva raj · Accepted Answer · 2013-12-25 13:50:51Z

Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); props.put("mail.smtp.port", "587"); transport.send(message);

JeSa · Accepted Answer · 2019-05-13 15:26:39Z

After 8 hours of pain, I've solved this by turning off:

1) my windows firewall

2) my antivirus software

hope this helps

Antariksh Gosain · Accepted Answer · 2020-11-22 10:30:28Z

For me, de-activating firewall and anti-virus did not work. I tried the alternate ports given in the mailtrap's SMTP settings 25 or 465 or 587 or 2525

changing spring.mail.port to 2525 in the applications.properties file worked for me

Congmin Qiu · Accepted Answer · 2016-10-28 04:46:31Z

I met the same problem, and the reason is that I opened a vpn. Hope this will be helpful.

Rogelio Navarrete · Accepted Answer · 2022-10-18 22:12:43Z

0

Open /etc/postfix/main.cf

Search /inet_interfaces line and comment localhost, un-comment all:

Restart the SMTP server using terminal command "postfix restart"

answered Oct 18, 2022 at 22:12

Rogelio Navarrete

1

1 Comment

Community Over a year ago

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Procrastinator · Accepted Answer · 2023-12-19 07:30:00Z

enter image description here

I will try this from two hour.I find out this issue.It is happened when we not properly config our JavaMailSender class.

From application.properties file the spring boot not pick properties. i debug and attatch the image below.Please check this to clear.

username ,host , port are null;

Make this class EmailConfig

@Configuration @Slf4j public class EmailConfig { @Value("${email.smtp-server}") private String host; @Value("${email.port}") private int port; @Value("${email.username}" ) private String username; @Value("${email.password}") private String password; @Bean public JavaMailSender javaMailSender() { log.info("Configuring java email sender :"); JavaMailSenderImpl mailSender = new JavaMailSenderImpl(); log.info("port : {}", port); log.info("Host : {}", host); mailSender.setHost(host); mailSender.setPort(port); mailSender.setUsername(username); mailSender.setPassword(password); Properties props = mailSender.getJavaMailProperties(); props.put("mail.transport.protocol", "smtp"); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.debug", "true"); return mailSender; } }

in application.yml file add

email: smtp-server: smtp.gmail.com port : 587 username: your-email password: 'your-app-password'

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