Seems the spelling correction cannot learn. Let me explain. When one writes a word, Apple will propose the corrected version, but of course we cannot expect this to be exact. So one says "no" by pressing the "x" next to the word (example here is mail). Only to see Apple re-correct the word again. Or Apple corrects the word on the fly, you notice this, go back and set it right, then .. wham ... Apple re-corrects back to what was not exact. Seems that Apple corrector does not have a learn function, or it is not activated. I tried looking in Mail preferences and System Preferences but do not seem to have found the right spot. Anyone has advice on how to manage the above, or more ?