Ebay's messaging system is quirky

[Modee]

I like to message my buyers with a corny but sweet message requesting feedback on a regular basis. A Hi how you doing would love some feedback type deal.

What I've noticed is that even though I never click the box to have a copy sent to myself, at least the first message sent does end up being copied to me, and sometimes some of the next set of messages too. No rime or reason to it.