Only the members of the list can send mails to the list (no risk of spam!). If you want to add somebody, send a mail to Julia HargreavesandJean-Yves Peterschmitt
The mails received through this list will have a '[PMIP P2F]' tag in front of the subject (if you want to locate them more easily in your mailbox)
When you reply to a mail sent to the list, it should go by default to the original sender of the mail (unless your mail reading program really messes up things). IF you want to reply to both the sender AND THE LIST, make sure to add the list to the cc field.