Hi Tracey.

The enrolment message should only be sent when a user is enrolled into the certification. The following messages are reset when the recertification window opens, which allows them to be sent again:

• Program completed (when a user certifies)
  
• Program due
• Program overdue
• Course set completed
• Course set due
  
• Course set overdue
• Recertification window open
• Recertification window due to close
• Learner followup

If you are certain that you're seeing Enrolment messages resent to users then there could be a few reasons:

• If you're manually clearing out records from the prog_messagelog then this would cause messages to be resent, not just enrolment messages. This table shouldn't be touched.
  
• If you've deleted and undeleted the user then this will cause all certification messages to be reset (as well as a bunch of other side-effects).
• If you've unassigned and reassigned a user then they will receive the Enrolment message again, by design, even if the user was restored into a certified state. The reasoning is that the user is going from "Not assigned to the certification" to "Assigned to the certifi cation" and they should be notified of this change.
• There's a chance that there's a bug causing the message to be sent again for some other reason, but I think it's extremely unlikely. In this case you should file a support ticket.

Nathan