E-mails are no longer sent to recipient(s). The SMTP settings in DX Netops Portal are correct and sending a test e-mail using telnet from the DX Netops Portal server works OK.
DX NetOps Performance Management all releases
The cause in this example was the DX Netops Portal server was unable to resolve the fully qualified host name. From the DMservice log (DX Netops Portal server) we can see the following error:
------snip------
ERROR | EmailJobTaskThreadPool-Thread-285 | 2019-10-09 08:00:48,858 | com.ca.im.portal.dm.scheduling.email.EmailJobTask
| Error sending email: myserver.domain.com
java.net.UnknownHostException: myserver.domain.com
------snip------
As we can see here DX Netops Portal is unable to resolve the fully qualified host name, myserver.domain.com.
When you run ping hostname only it works but ping myserver.domain.com fails.
Make sure you can resolve the fully qualified host names. As in the example above we can see ping fails, therefore DNS records must be updated or update /etc/hosts file to include the fully qualified host name and not just host name.