There's no way nor reason to launch most of the building material from Earth. In a boot-strappy way, we'll be mining the moon to build orbital solar power stations. The power stations and mining efforts will need larger and better living quarters for the workers, so we'll build habitats in the Earth-Moon area. The first big habitats will be built mostly out of crud launched from the Moon. Pulverized rock will be sintered into great tubes using focused sunlight, like a gigantic 3D printer. Unlimited material, unlimited energy. The colonies will become self-sufficient, and their people comfortably well-off providing power to Earth, perhaps exchanging rare materials, exporting the biological elements of Earth's many environments. But even if we build space elevators, the vast majority of Earth's inhabitants will never leave; space will not be an outlet for overpopulation.
Colonies will probably pop up around moon-sized Mercury next, then Mars' asteroid moons, and eventually the dark, distant asteroid belt. There is ample room and materials for millions of habitats, each essentially self-sufficient, once built. Robotics would mostly automate agriculture. Mining and habitat construction might be largely automated, too. There will be far more humans living in space than on crowded Earth. It will be too expensive and time consuming to bother colonizing the other planets. There is room and resources to continue growing unchecked for thousands of years, if not millions. Our race really never needs to leave the solar system.
I create unique email addresses too. I run a catch-all mailbox, so my scheme doesn't do much to prevent me getting spam. It tells me who has been compromised and I can be a good citizen and let them know. I give them one fair chance, and if they don't respond, or if they're retaliatory towards me, then feck 'em. Nobody ever gets my "real" email address. Most websites simply never respond to my information. If it's a blogger, they infrequently respond, but just to express doubt, and interrogate me about my unique email policy on the grounds that I'm violating some unwritten "real identity" rule of theirs. They can be real jerks to me, the friendly messenger. One major website swore they were secure but had been compromised once over a year before. Since my email naming convention is websitenameyeardate@mydomain, I could prove my email had been harvested much more recently. They still flat out said "didn't happen". Otherwise, almost none of my spam comes from "unique" addresses.
There is a small handful of once-valid addresses I used as a blogger and forum commenter which continue to get email after many years, even though my email server properly rejects them as unknown mailboxes. Strangely, most spam sent to me is constructed using common names like admin@ contact@ info@ and a short list of asian firstnames@ of all things. If a particular address gets enough activity, I will add it to my blacklist. Setting the server to reject connections from unregistered email servers actually blocks far more spam than complex rules could.
The most interesting episode was when I kept getting repeated attempts to relay an email to a particular address. I could see by that address, that the recipient was local to me and contacted him. He found his mailbox maxed out with these test emails from servers which -were- relaying. He'd registered at websites using that email address and used the same password everywhere, so when one website was eventually compromised, they tried his password on Road Runner, and had themselves a handy mailbox to dump email relay test results into.
Say "twenty-three-skiddoo" to logout.