Since the halacha is that having a Mezuza on the inside of the house is not kosher, what advice can I give people about placing their mezuzah so they will be able to keep the Mitzvah of Mezuzah properly?
I am doing a mass mivtza mezuza in a huge complex of buildings where the yidden live among many unfriendly & unsafe neighbors. They are afraid to put their mezuzos on the front door, and many have stories of people taking their mezuzos, harassing them or trying to destroy their mezuzos.
When there is Sakana (danger) one may affix the mezuzah behind the door underneath the lintel. If this is not possible, one may affix it behind the door on the doorpost (within a handbreadth to the door). In such a case no blessing is recited.
Shach (Yoreh Deah 289:3) in name of the Madanei Hamelech. See also the Aruch Hashulchan 289:14.