It is a tricky one. You can find Vendor's documentation here.
You can send a email with the sendEmail SIL routine and this menu option lets you provide parameters for this routine.
My templates directory provides the path to the email templates.
Mail language on lets you define the language of the sent email by Sender or Receiver. If you use email templates you can create templates for multiple languages. You can read more here.
Send mail via lets you define how your email will be sent. Here are the available options:
And you can see error and debug messages in the atlassian-jira-outgoing-mail.log if you have properly configured your logs. You can read more on how to configure email logging here. I prefer to use this option.
You will not see the email message in the Jira mail queue or logs in the atlassian-jira-outgoing-mail.log file, but you will be able to see log messages in the atlassian-jira.log file.
2020-05-24 14:19:53,601+0300 pool-42-thread-8 INFO admin 859x6032x1 aizaws 0:0:0:0:0:0:0:1 /rest/keplerrominfo/refapp/latest/async-script/runScriptFromEditor [c.k.r.sil.impl.MailConfigurationAccessor] NULL MAILER (log only mail sender) : Subject: aa, From: null, To: [firstname.lastname@example.org], CC: [email@example.com], Body: aa
If you click on this menu option you will see the following screen. You can find Vendor's information here:
Threads sets the number of threads for SIL engine. By default it is set to 10 which means that you can not execute more than 10 SIL scripts concurrently. If you have many scripts running at the same time consider to increase this value.
Time To Live (TTL) sets the time for a thread to live. The default value is 1 hour. It means that if a script runs more than 1 hour it will be killed. If you have long running scripts consider to increase this value.
Checkpoint Interval sets the time how often SIL engine will check running threads and kill the threads if the threads have been running for more than TTL time.
Also you can see all running tasks in the Running tasks part of the screen.