The present invention is mail alert system attached with the mailbox which is operated in connection with mailbox accessories. The device detects the presence of delivery of mail, generates a detection signal, transmits said detection signal, receives said detection signal at a remote, location, and alerts said user. The mailbox alert signal device has particular utility in connection with mailbox operated by motion sensors, wireless transmitter, a reciever located inside of remote structure, LED indicator, at least one audible alarm and a battery.