Mezuzah as Protection, Part 4

Hi,

"Rabbi Eliezer of Metz wrote: 'People are accustomed, for the sake of additional domestic protection, to write at the end of the mezuzah various seals and names of angels. This is not required, and it isn’t a mitzvah; it is only for added protection.'…It is clear that there is no disqualification [of the mezuzah] in this practice."

(Rabbi Ovadia Yosef, Yabia Omer 8:Yoreh Deah 28)

Have a great day,
Mordechai