What are the DTAILjobname files in the MailStream Plus work library

Product Affected:  MailStream Plus™
Operating System: iSeries IBMi AS400
In the work library of the IBMi machine there are lots of files -  DTAILjobname
Are these MailStream Plus™ (MSP) files?
Can we delete them?
Yes, these are used by MSP in the REPORT step to generate the various reports. 
Yes, you can delete them.  When you run a job, a new one will be generated.
UPDATED:  May 15, 2019