Mail Bombs are in a way related to the subject of disinfected mail:
- the mail is potential dangerous to the recepient
- authorities are taken actions for defenses, to ensure save communication
Definition: Mail bombs are mostly explosive devices in, generally, two categories: Parcel bombs and Letter bombs
Defending against mail bombs: e.g. education, X-ray machines and sniffer dogs
A good overview is given by:
Dale Speirs: The History of Mail Bombs, Postal History Journal No. 122 (June 2002) & Postal History Journal No. 123 (October 2002) & Postal History Journal No. 124 (February 2003)
Just to get a first impression refer to actual warnings by the U.S. Postal Inspection Service (link and attachment): https://postalinspectors.uspis.gov/radDocs/bombs.htm
