javax mail MessagingException Could not connect to SMTP host localhost port 25

Question

I am getting issue while sending email   javax mail SendFailedException  Sending failed    nested exception is       javax mail MessagingException  Could not connect to SMTP host  localhost  port  25    nested exception is       java net ConnectException  Connection refused  connect     at javax mail Transport send0 Transport java 219      at javax mail Transport send Transport java 81      at org apache jsp online 005fScheme 005fSend 005fMail jsp sendMail online 005fScheme 005fSend 005fMail jsp java 116      at org apache jsp online 005fScheme 005fSend 005fMail jsp  jspService online 005fScheme 005fSend 005fMail jsp java 416      at org apache jasper runtime HttpJspBase service HttpJspBase java 98      at javax servlet http HttpServlet service HttpServlet java 729      at org apache jasper servlet JspServletWrapper service JspServletWrapper java 369      at org apache jasper servlet JspServlet serviceJspFile JspServlet java 308      at org apache jasper servlet JspServlet service JspServlet java 259      at javax servlet http HttpServlet service HttpServlet java 729      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 269      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 188      at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 213      at org apache catalina core StandardContextValve invoke StandardContextValve java 172      at org apache catalina core StandardHostValve invoke StandardHostValve java 127      at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 117      at org apache catalina core StandardEngineValve invoke StandardEngineValve java 108      at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 174      at org apache coyote http11 Http11Processor process Http11Processor java 879      at org apache coyote http11 Http11BaseProtocol Http11ConnectionHandler processConnection Http11BaseProtocol java 665      at org apache tomcat util net PoolTcpEndpoint processSocket PoolTcpEndpoint java 528      at org apache tomcat util net LeaderFollowerWorkerThread runIt LeaderFollowerWorkerThread java 81      at org apache tomcat util threads ThreadPool ControlRunnable run ThreadPool java 689      at java lang Thread run Thread java 619      I use below code snipet   Properties props   new Properties         props put  mail smtp host    10 101 3 229      email send program is running on tomcat 5  Some times it is working fine and some times it results above exception  once it satart resulting above exception it results the same on every access  but as soon as i restart tomcat server it starts working fine again   So i could not find what is reason  as sometimes same is working fine and sometimes results above exception   Can anybody help me out this issue

User · Answer

Just look at this solution  make sure you ve turned access on to less secure apps on your google account  javax mail MessagingException  Could not connect to SMTP host  localhost  port  25

User · Answer

Try to set the property when starting JVM  for example  add -Djava net preferIPv4Stack true   You can t set it when code running  as the java net just read it when jvm starting   And about the root cause  this article give some hint  Why do I need java net preferIPv4Stack true only on some windows 7 systems

User · Answer

package sn  import java util Date  import java util Properties  import javax mail Authenticator  import javax mail Message  import javax mail MessagingException  import javax mail PasswordAuthentication  import javax mail Session  import javax mail Transport  import javax mail internet AddressException  import javax mail internet InternetAddress  import javax mail internet MimeMessage  public class SendEmail     public static void main String   args        final String SSL FACTORY    quot javax net ssl SSLSocketFactory quot       Get a Properties object     Properties props   System getProperties        props setProperty  quot mail smtp host quot    quot smtp gmail com quot        props setProperty  quot mail smtp socketFactory class quot   SSL FACTORY       props setProperty  quot mail smtp socketFactory fallback quot    quot false quot        props setProperty  quot mail smtp port quot    quot 465 quot        props setProperty  quot mail smtp socketFactory port quot    quot 465 quot        props put  quot mail smtp auth quot    quot true quot        props put  quot mail debug quot    quot true quot        props put  quot mail store protocol quot    quot pop3 quot        props put  quot mail transport protocol quot    quot smtp quot        final String username    quot xxxx gmail com quot         final String password    quot 0000000 quot       try        Session session   Session getDefaultInstance props                             new Authenticator                                 protected PasswordAuthentication getPasswordAuthentication                                     return new PasswordAuthentication username  password                                            -- Create a new message --       Message msg   new MimeMessage session          -- Set the FROM and TO fields --       msg setFrom new InternetAddress  quot xxxx gmail com quot           msg setRecipients Message RecipientType TO                           InternetAddress parse  quot user120 example com quot  false          msg setSubject  quot Hello quot          msg setText  quot How are you quot          msg setSentDate new Date           Transport send msg         System out println  quot Message sent  quot         catch  MessagingException e          System out println  quot Erreur d envoi  cause   quot    e

User · Answer

I was also facing the same error  The reason for this is that there is no smtp server on your environment  For creating a fake smtp server I used this fake-smtp jar file for creating a virtual server and listening to all the requests  If you are facing the same error  I recommend you to use this jar and run it after extracting and then try to run your application    Download latest version of fake smtp

User · Answer

This should not happen  Can you try doing this  Use the system properties and set the property as below   Properties properties   System getProperties       Setup mail server properties setProperty  mail smtp host    10 101 3 229      And if you have a port associated  then set this as well   properties setProperty  mail smtp port    8080

User · Answer

It is very clear from your exception that it is trying to connect to localhost and not to 10 101 3 229   exception snippet   Could not connect to SMTP host  localhost  port  25   1   Please check if there are any null check which is setting localhost as default value  2   After restarting  if it is working fine  then it means that only at first-run  the proper value is been taken from Properties and from next run the value is set to default  So keep the property-object as a singleton one and use it all-over your project

[java] javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25

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