A letter box can be a sizeable hole in the exterior door. For exact measurements see the new EU regulation : DIN EN 13724 Postal services - Apertures of private letter boxes and letter plates - Requirements and test methods. A snip at only 103.30 €
A letterbox is the only part of a property that is publicly accessible 24 hours a day and exposes the premises and its occupants to all four main risks defined by the Insurance industry: from fire, water damage, malicious damage and weather-related damage.

There is a web site out there that gives detailed instructions on how to construct a tool to open doors. But I'm not putting the link here, as it might give thieves the wrong idea !
There are various safety devices available to reduce the risk:
a cover a fire retardant cover mans best friend
a cover a fire retardant cover mans best friend





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