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I sent every modeller registered on Sumea a short email about the modeller challenge #4, and I seem to have receive quite a few bounces.. also, there've been members who have removed their email address entirely..
If you want your email to remain anonymous, that's fine.. Sumea doesn't reveal your email address to anyone at all. They can send you an email through Sumea, but they don't know your address unless you reply to them.
I'll probably listing the offenders here shortly, so if you see your name, please put in a valid email address in your profile..