Hybris/ SAP commerce Cloud: Retry failed/not sent emails due to SMTP connection issue.

 

1. Add Configuration in Local.properties file.

email.retry.attempts = 5
#in milliseconds 300000 ms = 5 minutes
email.retry.interval  = 300000

2. Add  "retryAttempts" attribute in EmailMessage item

<itemtype code="EmailMessage" generate="false" autocreate="false">
   <attributes>
      <attribute type="java.lang.Integer" qualifier="retryAttempts">
         <persistence type="property"/>
         <modifiers unique="false" optional="false" read="true" write="true" search="true"/>
         <defaultvalue>0</defaultvalue>
      </attribute>
   </attributes>
</itemtype>

3. Extends OOB DefaultEmailService and override send(EmailMessageModel message) method

@Service("testDefaultEmailService")
public class TestDefaultEmailService extends DefaultEmailService  {

   @Resource(name = "modelService")

   private ModelService modelService;

    private int  maxRetryAttempts;

    private int emailRetryDelay;

    @PostConstruct
    void init(){
     maxRetryAttempts = configurationService.getConfiguration().getInt("email.retry.attempts");
     emailRetryDelay = configurationService.getConfiguration().getInt("email.retry.interval");
    }
    @Override
    public boolean send(EmailMessageModel message) throws RetryLaterException {
        boolean sent = super.send(message);

        if(!sent && message.getRetryAttempts() < this.maxRetryAttempts && message.getProcess() != null ) {
            message.setRetryAttempts(message.getRetryAttempts() + 1);
            modelService.save(message);
            slf4jLogger.info("Email sending failed - for PK  [" + message.getPk() + "] and Process [" +  message.getProcess().getCode() + "] and its subject:  " + message.getSubject() );
            final RetryLaterException retryLaterException = new RetryLaterException();
            retryLaterException.setDelay(this.emailRetryDelay); // in milliseconds
            retryLaterException.setMethod(RetryLaterException.Method.LINEAR);
            retryLaterException.setRollBack(false);
            throw retryLaterException;
        }
        return sent;
    }
}

OOB Hybris is configured in such a way that when we throw RetryLaterException
in an action (business process action) then that particular action will be processed/triggered again after specified interval of time.
in my case I have set retrigger delay as 5 minutes and I am retrying 5 times .