[7steps2much]

Yes. That said, i do also believe that taxation would have to be fair. Assuming you spent less than ten hours on these mails in total that would mean you would "earn" so little that most likely you would have not earned enough to have to pay any tax anyways.

Not to mention that in a situation like this they probably wouldn't come after you anyways, but i think they should still have the right to.

Also please note: This stems mostly from my personal opinion of not doing work outside of work hours unless explicitly agreed to. If I am on a vacation i don't do work unless everything back home is collapsing in a pile of flaming garbage.