email not working in 18.3

 I have setup a new environment with 18.3 and i'm unable to send email out, custom.properties and password. properties are check and the configuration seems to be correct (same as it is working in 18.1). I've looked into the unattended-request-poller and i see "[localhost-startStop-1] INFO  com.appiancorp.process.workpoller.UnattendedRequestPollerLoader - Unattended Request Polling Framework started in 0:00:00.015" in unattended-request-poller nut under mail-lister i see this "[localhost-startStop-1] INFO  com.appiancorp.process.emailpoller.EmailPollerLoader - No endpoints configured in custom.properties...EmailPoller will not be enabled" . What endpoints needs to be configured ? Are there any other log files that needs to be looking into for email alerts? Ateast in 18.1 there was alert option under runtime data to test system alerts which i cant seem to find in 18.3

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