LOL

i was wondering, in an email exchange, do i have to reply when someone replies to an email i just sent by simply saying "LOL"?

i mean, does that require a response, or is that the final email?
i'm never quite sure when an email exchange is over...

and what about when someone sends that final "thanks" email? is it over then? or should you reply with a "of course" or "you're welcome"?

if you did, then i think that would definitely be the end of the correspondence. or, at least, the onus would be on the other person to come up with what they should say next... unless that other person is you, in which case you should begin reading the first part of this thought again, and just keep looping around until the answer occurs to one of us...