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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM4PR12MB5167.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: f0656ac8-bfaa-45ef-6ee0-08d97e72a2b9 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Sep 2021 09:15:06.7444 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: +oVPa/cFAJTsSmz+IqjnmBe2dtHGQKyqwL1hgr3dCsw14m251KtrNL5FCLLikRXtxz0lD/yjG86yTriyrDxVEQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5216 Subject: [dpdk-web] DMARC mitigation in dpdk.org's mailing list X-BeenThere: web@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK website maintenance List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: web-bounces@dpdk.org Sender: "web" Hi all, Due to the changes that Mailman (our mailing list software) does to posts b= efore distributing them, DKIM and DMARC verification will fail for emails o= riginating from the domains that support them. This causes some posts to go= into spam/quarantine and sometimes completely discarded depending on the d= omain's policy. DKIM (DomainKeys Identified Mail) is a form of email authentication that us= es public key cryptography to digitally sign outgoing emails. Senders add t= his signature to the headers of the email message for the receiving mail se= rvers to validate against. The sender specifies which of the original heade= rs is covered by this signature. DMARC (Domain-based Message Authentication, Reporting, and Conformance) bas= ically allows domains to publish policies that tell receiving mail servers = how to handle DKIM verification failures. Strict policies can be set to eit= her reject (message not delivered to user's mailbox), or quarantine (spam/j= unk) the messages failing them. I would like to propose making some mailing list configuration changes to m= itigate and reduce signature breakage: - Disable prepending subject prefixes (e.g., [dpdk-dev]). Making this change will probably break the rules and filters list members= have for their mailboxes if they filter by the subject prefix. Members can filter by Mailman's List-Id header instead, or by the To/Cc h= eaders. - Disable rewriting the "Sender" header. Mailman replaces this header by default with the list's bounce address to= direct bounces from some broken MTAs to the right destination. - Disable conversion of text/html to plain text. Mailman currently strips MIME attachments and does text/html to plain tex= t conversion. We experimented for a while with these changes in a test list we created (h= ttps://mails.dpdk.org/listinfo/test-dmarc), and we found that they helped i= n mitigating signature breakage. We tested with signed emails from the domains: nvidia.com, broadcom.com, an= d gmail.com. We verified that posts on the test list showed passing DKIM/DM= ARC results in their 'Authentication-Results' header. We plan on making these changes to users@dpdk.org and web@dpdk.org first, a= nd then to the rest of the lists once we make sure there are no unexpected = issues. Any feedback will be appreciated. Thanks, Ali