1989 | 11 Episodes

Season 1 of Mailbox X premiered on January 2, 1989.

1989 | 13 Episodes

Season 2 of Mailbox X premiered on November 18, 1989.

1990 | 29 Episodes

Season 3 of Mailbox X premiered on September 21, 1990.

1991 | 13 Episodes

Season 4 of Mailbox X premiered on November 15, 1991.

1992 | 21 Episodes

Season 5 of Mailbox X premiered on September 30, 1992.

1993 | 13 Episodes

Season 6 of Mailbox X premiered on October 6, 1993.