Would be something like:
<Monster Name> Gave you <Exp Amount>
And you could check it by typing /Exp
Or even better, on another TAB on chat history (Yes. Just like WoW do with Combat Log)
There is no need to save it on Server Side. It would be 100% Client side with the only purpose to inform How much exp you had before and how much u have after killing a mob
After suceeding with this suggestion, I could bring tons of new other suggestions alike
