hi, i just would like to ask, is it legal to accept money like via paypal, in exchange of emailing rare items ingame?

i tried the search, but i didnt find info on this

I don't think so...

But idk why since I know its done on SWG and not much is done.

So I'd advise not to do it.

Legally, all game items are the property of the company running the game and therefore aren't yours to sell. 

i dont want to sell, but ive read the thread about the asassin mask, that one fo the owners was like "i wont sell the mask, not for $info and neither for real money.... " and so on, and i just wanted to know if this could really happen otherwise normally

Yes, people offer RL money all time for items. It is against the EULA to buy or sell ingame items and accounts. So you shouldn't buy items/info.