This article shows how to set the time period between Exalate emails. Exalate sends emails with error notifications to administrators. Use the mail.smtp_backoff variable to control how often you  receive emails from Exalate. For example, you can set up Exalate to send an e-mail every 10 minutes.
- Open the setenv.sh file in your Jira folder.
 In the file, you can set properties and options on startup.Note: For more information about adding variables in Linux and Windows, please check this Atlassian article. 
- Locate the JVM_SUPPORT_RECOMMENDED_ARGS=""property and modify it to the following:JVM_SUPPORT_RECOMMENDED_ARGS="-Dmail.smtp.backoff=10" The -Dmail.smtp.backoffproperty is in minutes and it must be a positive number. For example, if-Dmail.smtp.backoff=10, Exalate will send an email every 10 minutes.
- Restart the service.