{"type":"rich","version":"1.0","provider_name":"Transistor","provider_url":"https://transistor.fm","author_name":"Cybersecurity Tech Brief By HackerNoon","title":"How Mailing Lists Break DMARC, and Why ARC Only Partly Fixes It","html":"<iframe width=\"100%\" height=\"180\" frameborder=\"no\" scrolling=\"no\" seamless src=\"https://share.transistor.fm/e/2a7f41e7\"></iframe>","width":"100%","height":180,"duration":344,"description":"\n        This story was originally published on HackerNoon at: https://hackernoon.com/how-mailing-lists-break-dmarc-and-why-arc-only-partly-fixes-it.\nWhy mailing lists break DMARC, what ARC (RFC 8617) actually does about it, why it only helps where the receiver trusts the sealer, and why From-munging is the reliable fix.\nCheck more stories related to cybersecurity at: https://hackernoon.com/c/cybersecurity.\n            You can also check exclusive content about #email-authentication, #dmarc, #dkim, #mailing-list-management, #email-deliverability, #dmarc-alignment, #mailing-lists-vs-dmarc, #mailing-list-security,  and more.\nThis story was written by: @vadimivanov. Learn more about this writer by checking @vadimivanov's about page,\n            and for more stories, please visit hackernoon.com.\nMailing lists break DMARC because they modify messages and forward from their own servers. ARC lets a list vouch that the message passed DMARC before it touched it, but only helps at receivers that evaluate it and trust the sealer's reputation. From-munging is the universal fix; run both.\n        \n        ","thumbnail_url":"https://img.transistorcdn.com/SySK4I0jwuU6AzeawZdYiDqTq8yzBjxJ5qfTpUuAxEo/rs:fill:0:0:1/w:400/h:400/q:60/mb:500000/aHR0cHM6Ly9pbWct/dXBsb2FkLXByb2R1/Y3Rpb24udHJhbnNp/c3Rvci5mbS9zaG93/LzQxMjY2LzE2ODM1/ODIzNTYtYXJ0d29y/ay5qcGc.webp","thumbnail_width":300,"thumbnail_height":300}