Junkmail Robot
From Tardis Wiki, the free Doctor Who reference
Junkmail Robots were Delivery Bots used to send messages.
Kingpin once used a Junkmail Robot to contact the Seventh Doctor for help. (AUDIO: The Psychic Circus)
Behind the scenes
The Junkmail Robot strongly resembles a Kerb!am Man - another Delivery Bot. Like the Kerbl!am Man, the Junkmail Robot was able to breach the TARDIS. (TV: Kerblam!)