java.net.SocketException: Connection Reset while Reading Mails

Question

javax.mail.MessagingException: Connection reset; nested exception is: java.net.SocketException: Connection reset

I have a service to read mails from outlook. Receiving the above error randomly. What would be the root cause of this issue. Using JAVA 8 and javax.mail-1.6.2 to read mails.

Below is my mail settings

Properties props = new Properties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.host", "outlook.office365.com"); 
props.put("mail.smtp.socketFactory.port", "587"); 
props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true"); 
props.put("mail.smtp.port", "587");
props.put("mail.smtp.starttls.enable", "true");

there could be a (conection) leak in your code (like here) ..or if you operate your jakarta "within a cloud" read here (kubernetes) — xerx593
– xerx593, Commented May 12, 2021 at 12:38
@MarkTobin this error occurs randomly once or twice in a day — Saravanan Shanmugaraj
– Saravanan Shanmugaraj, Commented May 12, 2021 at 14:42

Mark Tobin · Accepted Answer · 2021-05-12 16:13:08Z

The problem is more likely to be a network issue than an issue with your application. It might be worth having a look here to see if any of those probable causes are likely or possible in your circumstance. Having had a similar issue with outlook previously with no root cause established, mitigation is also an option. Below shows a basic retry mechanism which, in practical terms, eliminated the issue.

            // send email with try-catch loop 
            int count = 0;
            int maxTries = 5;
            while(true) {
                try {
                    // get and set your protocols
                    mailSender.send(message);
                    break;
                } catch (Exception e) {
                    if (++count == maxTries) {
                        // Give up and throw the error
                        throw e;
                    }
                }
            }

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