I sent my email via messaging to a buyer 2-3 months ago. An enquiry about one of my items (which he ended up buying) lead to general chit chat going back and forth over a few weeks and the discovery that we have similar interests. It also turns out we are in the same profession. There are now regular emails going back and forth between us. Maybe because there was no mention of offering an item off ebay for sale that my email didn't get blocked from him?