what is mean mail slot ???

mail slot
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Can someone please show me what the mailslot in the hp 18 autoloader is used for? i'm install MSL6030 i'm seen user guide manual but not understand mail slot i have 5 LTO tape slot is empty and 0~4 slot is tape

jack and the beanstalk free slot games Total Slot Dimensions: 13 in W x 4 in H; Door Dimensions: 10 in W x 2 in H; Weight: lbs; Stainless Steel Finish; Mail Slot Sleeve Sold Separately  Can someone please show me what the mailslot in the hp 18 autoloader is used for?