How can I contact a member when there is no e-mail address given?
You can
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Wait until you’re approved for full membership (see https://forums.chiffandfipple.com/t/important-policy-change-new-user-registrations/89140/1), then contact the member by PM. Or
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Post a (public) e-mail contact request on one of the sub-forums that the member frequents.
Cheers, - Moderator