Today I received this terrific envelope from David Dellafiora [Field Study, PO Box 1838, Geelong VIC 3220, AUSTRALIA]. He wrote (mysteriously!) that he "came across [my] details in the network". I will write back to him and request more information. Was it from Ross Priddle's wonderful Bentspoon blog? ... Inside the envelope were invitations to mail art projects, a card, and some artistamps (same as the 'HELL' stamp on his envelope). David, it is a pleasure to make your acquaintance through the Network and postal service! Thanks for getting in touch. I'll write back soon.
P.S. A search turned up David's blog here.