Please send them to firstname.lastname@example.org. Visit GMail invite spooler for more information.
I've used this successfully in the past to hand out email invites. The only catch is that you'll not know who is the actual person ending up getting your email-id, < update > and someone else will know your email-id < update > . If you consider that to be a security risk, you can keep those invites to yourself or hand them out individually.