Thanks,
Gary
Gary, I'm going to hypothesise here, which is quite useless actually.
I'd say only activity when the course is open is reflected in e-mails to subscribed participants. Prior to opening and after opening, no dice.
But of course, I may be wrong, and you may need to do a test.
-Derek
In my organisation, I found that messages posted in the News Forum DID go out to students, even when the course was Unavailable.
The normal cron processes on Moodle only send out messages created today to students who are currently enrolled. Later enrolments don't get a flood of email: they have to read the Forum, to catch up on what has already been said.