Hi guys, on my quest to understand emails in GSA and speed up the process, I found a useful free tool that converts the bulk format emails (like when buying on fiverr) to uploadable GSA format. "email@example.com" >>converts to>> "firstname.lastname@example.org:pop3.live.com:995:email@example.com:free123:1"
NOTE: This link sometimes seems to load back into the home page. If it does, there's a large button that says "GSA SER Format Convert Tool" right there. This guy also sells large amounts of hotmails and other emails also.