Where does “nonspam” come from?

nonspam (English) comes from English non, from French non, from Old French non, from Latin nōn, from Old Latin noenum, from Proto-Indo-European óynos — one; single.

nonspam (English): Electronic mail that is not spam (junk mail); legitimate e-mail

Definitions

  1. Electronic mail that is not spam (junk mail); legitimate e-mail

Ancestry of “nonspam”, step by step

nonspam traces back through two separate lines of ancestry.

via English non

StepLanguageWordMeaning
1EnglishnonObsolete form of none
2Frenchnonno; not; a no, a negative response
3Old Frenchnonno; not; Alternative form of nom
4Latinnōnnot
5Old Latinnoenum
6Proto-Indo-Europeanóynosone; single

via English spam

StepLanguageWordMeaning
1EnglishspamUnsolicited bulk electronic messages; Any...
Every word from Proto-Indo-European óynosEvery word from Old Latin noenumEvery word from Latin nōn