Add sent email recipients to course mailing list

Your sent email recipients aren't added to mailing lists, so enrollment outreach misses contacts. Adds those recipients to the right course list so coordinators can run outreach within minutes.

Overview

If recipients from your outgoing messages aren't captured, enrollment outreach gaps appear and coordinators scramble to rebuild lists. This flow automatically harvests those recipients and seeds the correct course list so program coordinators have contact-ready lists within minutes, enabling prompt outreach before launches.