Unique ID you use to identify employees in your organization.
For employees created through Invite, an employee id is automatically generated, which you can change later.
To speed up the emailing process, the system will add the emails in queue and will send them via cron job.
Choose No to send email immediately (Slower).
Choose Yes to send emails in background (Faster).
*Make sure the cron job is configured properly to use email queueing.