Anyone can send an email to anyone else and make any claims they like. Now please prove to us that the "collaboration" and events described in that email actually took place.
Do you feel threatened by being asked to justify a claim? Perhaps you expect people to take this UFO stuff for granted without skepticism? Sorry... if that's the sort of community you're looking for, /x/ may be more your forte.
>but you may find this interesting
I notice every one of your sources reference TTSA, and this link does as well, and contains more claims from Tom Delonge, but you haven't actually justified your treatment of these claims or sources as factually accurate. You can't prove Tom Delonge is credible with more quotes from Tom Delonge, that's not how proof works.