Hy, I am facing a stability problem in sending email notifications. When I start the server, everything works fine. I can see the listener in my test Nuxeo (Admin / Monitoring / Nuxeo Event Bus), for example:

• Id listener Listener class Number of calls Total time %
  
• workflowInstancesCleanup DocumentRoutingWorkflowInstancesCleanup (async) 1 calls 50ms 1.81%
  
• notificationListener NotificationEventListener (async) 5 calls 1572ms 56.98%
  

After a while, the counter does not increase anymore and the email notifications are no longer sent …. The remote remote-debug shows me that EmailHelper.sendmail () is no longer reached then.

But the next day, it can go off without restarting the server …

My system environment:
CentOS 7
jdk1.8.0_181
nuxeo-server-tomcat-8.10-HF34
sending emails: smtp: // localhost: 25 (postfix)

Thank you for any suggestion. Henri