A mail list is a list of e-mail addresses identified by a single name, when an e-mail message is sent to the mailing list name, it is automatically forwarded to all the addresses in the list.
For members of Air-Stream Wireless an e-mail to the name "members" the e-mail will be sent to all other Air-Stream members who have an active email account. To prevent spam being sent to this address and so all other members, only an active member account may send emails to this name.