This item is crafted by engineers with a skill of 425.
This item is not soulbound, and the cooldown is on the engineer, rather than the device. Therefore it's possible to pass MOLL-E to a fellow engineer (provided that he/she has the required engineering skill) to deploy the mailbox while you are on cooldown.
Inspired by the title character from the movie WALL·E, which stands for Waste Allocation Load Lifter Earth-Class.
WotLK Patch 3.2.0 (patch date::04-Aug-2009): Significantly reduced the cooldown.
Reduced from 8 hours to 2 hours
WotLK Patch 3.0.8 (patch date::2009-01-20): Changed from common to rare item, cooldown reduced to 8 hours (down from 1 day), duration increased to 10 min, and can now be put into an Engineering bag.