>>In the days of sailing ships, a yellow flag flown from the yard arm indicated a foreign ship - having just come into port - and requesting health inspection. Pending inspection, the ship would be held under quarantine. I wonder if that is why nonmembers have yellow envelopes? We are momentarily in quarantine I guess (g) Quite understandable and perfectly logical actually. :))
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>Never thought of that. :)
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One time I was going to ask the same question, but then decided that for new members it is associated with nestlings (chickens? :) which have yellow mouth. :) It is common association in Russia.

Nick