Shalom Aleichem – "Peace be upon you" - is the original Jewish saying, and adopted by Muslims as their greeting.
"Peace be unto you" appears to be a Christian version of Shalom Aleichem. Christianity had an early habit of twisting most things Jewish, e.g. making the first day of the week the Sabbath instead of the 7th, etc.
In England they have "how do you do" as a greeting. A somewhat quaint phrase that we could re-phrase in modern terms as "how're doing", or "how ya doin?
In the USA the greeting tends to be "how are you?". When I first visited the US in the 1980s my first response was to tell the greeter how I was, this simply caused blank looks if one says anything other than, I'm fine thanks, how are you, etc.
Greetings and good-byes (curiously goodbye comed from God be with you), generally don't mean much other than ice-breakers, or politeness. But in verbal encounters with the appropriate tone of voice, both these apprantly friendly gestures can esily be turned into hatred.
So we really don't know whether our numbered member here uses the signature out of politeness and sincerity or sarcastic hatred, especially since it is followed by a wink. Emotionally, I find the signature very irritating, almost as bad as LG's infuriating avatar.