In recent years DMARC has become one of the cornerstones of email deliverability. A large part of email is now protected by the combined efforts of SPF, DKIM and DMARC checks. However, the secret weapons of DMARC which are hardly used are its reports. Along with respecting the policy set by an email sender, the recipient also actively acknowledges how many emails have been sent, from which IP addresses and why some of them have been delivered and others not. This reporting is done by providing a xml file inside a zip attached to an email, which makes it rather hard to digest for humans. Imagine what happens if you get such a report every day for every internet domain you, all of your colleagues and anybody spoofing you send emails to...

Obviously this calls for a tool. Interestingly, even though DMARC is almost a decade old, no good FOSS tool was ever developed. This is why DMARCaroni was created: free and open source software (written in Haskell and Elm) to deliver all your DMARC monitoring needs. In this talk I will unveil this new tool which I wrote in the last 18 months, show off its features, and talk about the roadmap.