I had DKIM, SPF, rDNS, etc. at first and went to Gmail spam. I registered on gmail postmaster tools and got some friends and family to add me to their contact lists and send me some outbound mail. Google now sends me more mail than I send them, and now I don't go to the spam list, even for gmail accounts I haven't contacted before. This was for personal email. If you are trying to send commercial email this strategy probably won't work.