Disinfected mail or fumigated mail is mail that has had some form of disinfection or fumigation applied to it by postal authorities, with the intention of preventing the spread of epidemics via letters sent from infected areas. The usual practice was to puncture the envelope with small holes, often in a grid pattern, or to snip off one or more corners, in order to let the fumigation gases in.
Disinfected mail or fumigated mail is mail that has had some form of disinfection or fumigation applied to it by postal authorities, with the intention of preventing the spread of epidemics via letters sent from infected areas. The usual practice was to puncture the envelope with small holes, often in a grid pattern, or to snip off one or more corners, in order to let the fumigation gases in.
Source: Wikipedia "Disinfected mail" · CC BY-SA 4.0
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