E-mail delays on HDRI list

Apologies to Martin and Christian, whose postings to the HDRI list were delayed. You need to make sure that you send from the same account you receive the list on, otherwise your e-mail gets quarantined until the list manager (me) has a chance to look at it. As there's been a sudden surge in spam on the list, I have been putting off looking at blocked messages, and didn't notice these were in the queue.