I am sure these email addresses are valid, but they are from people who run their own mailserver and can easily add a reasonable address for themselves, so I agree with your conclusion. More importantly, I want to thank you for your quick response, for phabricator, and your passion!

I have written a couple of scripts to semi-automatically convert trac ("done") and roundup (WIP) to phabricator. The included patch based on D10754 but extended does quite a good job at faking timestamps even for subtasks and notifications etc, but the whole thing is neither complete nor bullet-proof or even convenient. Good enough for people who don't mind to get their hands dirty: https://github.com/lambdafu/phabricator-test