No return address or return address differs from postmark.
Foreign postmarks and writing, or misspelled words.
Addressed to title only or wrong title with name.
Marked personal, confidential, private, special delivery, or do not x-ray, etc.
Excessive postage.
Peculiar odors, (such as shoe polish or almonds).
Oily stains, ink stains, discoloration, or crystallization of wrapper.
Wires, strings, or foil sticking out.
Excessive tape or sealing material or inner sealed enclosure.
Items containing a powder-like or unusual substance.
Unusual or abnormal shape, size, or weight.
Lopsided or uneven, rigid or bulky.
Do's and Don'ts
Don’t open, touch, move, shake, or immerse in water any suspicious packages or letters.
Don’t cut tape, strings, or other wrappings.
Don’t taste or smell package or its contents.
Do report all suspicious packages and letters to the authorities.
Do wash your hands immediately after handling the mail.
If suspicious mail is believed to be a bomb evacuate the building and call 911.
If suspicious mail is believed to contain a chemical or biological agent isolate the area and those exposed. If exposed wash hands and exposed skin with warm soapy water. Call 911.
If suspicious mail is believed to contain a radiological threat evacuate the area and call 911.