@jlelse What does "Google is excepting my mails with DKIM, SPF and DMARC after just a few conversations with Gmail users" mean, exactly? You had DKIM and SPF and Gmail marked your mails as spam some of the time and now it doesn't do it any more? Or are you just saying you have all three enabled and your mail gets delivered, but you don't know whether enabling DMARC made a difference?