When you find that in the Jaspersoft report server installation process you did not enter the information to configure the email server in Jaspersoft and If the default configuration is kept the report schedules fails:
Error: Job: report (ID: 11) Report unit: /ca_ppm/reports/administration/CSK_ADM_DataWarehouseSchema Quartz Job: ReportJobs.job_11 Quartz Trigger: ReportJobs.trigger_11_0 Error Message: The job error notification was not completed. An error occurred while sending it. Exceptions: org.springframework.mail.MailSendException: Mail server connection failed; nested exception is com.sun.mail.util.MailConnectException: Couldn't connect to host, port: mail.localhost.com, 25;
If the need is to change this email service configuration, below resolution is a quick view of how to do this.
Release: All Supported Releases
Component: Jaspersoft for Clarity PPM
if the SMTP server connection is via secure connection "SMTPS" then you may also need to enable SMTPS in jasperserver-pro\WEB-INF\applicationContext-report-scheduling.xml file:
AND change the following (to true):
<property name="javaMailProperties">
<props>
<prop key="mail.smtp.auth">true</prop>
</props>
</property>