Not only is it not necessary, it's better without it!
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JoevieePlease have a look at this sentense,I agree with G.G. How earlier "on" and later "on" came into being, I have no idea. O.K. in casual speech, but I'd never
"I was supposed to email you earlier on and am so sorry for the late reply..........,"
Is the "on" necessary here or optional?
Thanks:)
How earlier "on" and later "on" came into being, I have no idea.