Item #: SCP-746
Object Class: Safe
Special Containment Procedures: SCP-746 is to be installed within the grounds of Site ██. A locking mechanism should prevent unauthorized personnel from utilizing its abilities.
Description: SCP-746 appears to be an ordinary United Stated Postal Service public mailbox. Scratches and markings consistent with normal use are present on the outside. The mailbox is equipped with a standard drop slot, and a locked access door. SCP-746's abilities only become apparent when mail is dropped through the slot.
When any letter or package is inserted into the drop slot, said parcel arrives immediately at the recipient address. This has been tested and confirmed, with the transaction happening just microseconds after a package is mailed. In the case of parcels with insufficient or no postage, or an invalid or missing recipient address, the letter or package arrives immediately at the return address. If there is no return address, the mail is lost. Packages containing tracking devices have been unsuccessful in transmitting their location when lost in this manner. Parcels may also be mailed through the access door; they are sent as soon as the door is closed and locked.
Due to its properties, SCP-746 is very valuable to Site ██. It may be used for routine correspondence with other sites or recipients, especially in the case of an on-site emergency. SCP-746 may also be used to mail other safe-class SCPs, but great caution must be taken in ensuring correct addressing and postage of such packages.
A test was performed in which a sticker labeled "Mailbox #87" was attached to SCP-746. A letter was then mailed from another site, addressed to Site ██, Mailbox #87. The letter arrived successfully in SCP-746's compartment. SCP-746 may therefore be used to receive mail for Site ██.
Testing with packages containing live animals or humans is pending following a request by Dr. Valence.