from july 1989, a new mailbox system was introduced which allowed for single messages of up to five frames in length, storing of messages prior to sending, sending to multiple recipients, either individually or via a mailing list, forwarding of messages, and requesting an acknowledgment of receipt. whilst sending a simple mailbox using none of the new facilities remained free, all of the new options were charged at 1p per use per recipient. for the first time, the sending of spam was accounted for and permitted, albeit at 20p per recipient. in addition, the stored message facility was replaced by a summary page, which listed all the messages, both new and old, that were waiting. the user could then pick which message to view, rather than being required to read through them all in chronological order. as only the first 20 could be accessed, this effectively allowed for up to 19 messages to be stored while allowing the continued reception of new mail.