Hi Glenys and Saurabh,
We use the participants' list to send e-mail to a class just as Saurabh does. For us, e-mail and forums are two different forms of communication. Teachers include themselves in Moodle e-mail from the participants list, and so do have a record of what has been sent. We find that students and faculty participating in a forum do not appreciate a deluge of mail, so while we start forums up with everyone initially subscribed, we give participants the option to stop receiving e-mail should they prefer to read forum discusions in situ.
Saurabh--to get around the awkward omission of a subject line in tbe participants' e-mail set up, we treat the first five or so words as the subject line. That is where they appear when the mail is sent. I have not been able to find documentation on how many characters are converted into the subject line, but it seems to be roughly the first five words.
Other than the absence of a user-set subject line, sending e-mail from the participants' list works well. The text is formatted and the process is quick. A teacher with a participants' list has no need to set up a mailing list elsewhere. The process produces an individual e-mail to each participant, rather than a message with a bunch of CCs and so is robust in that regard.
Regards,
Lisa