https://dmarcloop.com/blog DMARC, SPF, DKIM and the mailbox providers' rules, from the DMARCLoop team. en Tue, 10 Nov 2026 00:00:00 GMT https://dmarcloop.com/blog/outlook-com-blocking-was-a-microsoft-fault https://dmarcloop.com/blog/outlook-com-blocking-was-a-microsoft-fault Microsoft says a faulty spam-rule update caused this week's Outlook.com and Hotmail rejections, and has rolled it back. What changed, and what still matters. Tue, 10 Nov 2026 00:00:00 GMT Outlook.com Microsoft DMARC bounces https://dmarcloop.com/blog/outlook-rejecting-mail-without-dmarc https://dmarcloop.com/blog/outlook-rejecting-mail-without-dmarc Outlook.com and Hotmail began rejecting some mail from domains with no DMARC record in November 2026. What the bounce means, who it affects, and the fix. Sun, 08 Nov 2026 00:00:00 GMT Outlook.com Microsoft DMARC bounces https://dmarcloop.com/blog/gmail-yahoo-microsoft-sender-rules https://dmarcloop.com/blog/gmail-yahoo-microsoft-sender-rules What Gmail, Yahoo and Outlook.com require of senders in 2026: SPF, DKIM, DMARC, spam rates and unsubscribe, the volume thresholds, and the bounces you get. Tue, 27 Oct 2026 00:00:00 GMT Gmail Yahoo Microsoft sender requirements bounces https://dmarcloop.com/blog/reading-a-dmarc-bounce https://dmarcloop.com/blog/reading-a-dmarc-bounce What each authentication bounce from Gmail, Outlook.com and Microsoft 365 means, and the fix for each: 5.7.26, 5.7.509, 5.7.515, 5.7.1 and the rest. Tue, 13 Oct 2026 00:00:00 GMT bounces Gmail Microsoft DMARC SPF DKIM https://dmarcloop.com/blog/p-none-to-p-reject-in-60-days https://dmarcloop.com/blog/p-none-to-p-reject-in-60-days p=none gets your mail delivered but stops nobody sending as you. A 60-day path to p=reject: quarantine by day 30, reject from day 60, and what each step needs. Tue, 15 Sep 2026 00:00:00 GMT DMARC p=quarantine p=reject rollout https://dmarcloop.com/blog/microsoft-365-dkim https://dmarcloop.com/blog/microsoft-365-dkim Microsoft 365 doesn't DKIM-sign mail from your own domain until you turn it on, so DMARC rests on SPF alone. How to find out, and the two records that fix it. Tue, 18 Aug 2026 00:00:00 GMT Microsoft 365 DKIM DMARC alignment https://dmarcloop.com/blog/auditing-third-party-senders https://dmarcloop.com/blog/auditing-third-party-senders CRMs, helpdesks, invoicing and payroll tools send as your domain and often fail DMARC alignment. How to find them in your reports and fix each one. Tue, 21 Jul 2026 00:00:00 GMT DMARC alignment third-party senders SPF DKIM