Strengthening Email Ecosystem: Outlook’s New Requirements for High-Volume Senders

What we recorded

Read 2026-11-11 through a fetch tool that can summarise. Published 2025-04-02, updated 2025-04-30. Applies to domains sending more than 5,000 emails a day to Outlook.com consumer addresses (hotmail.com, live.com, outlook.com). SPF must pass, DKIM must pass, DMARC at least p=none aligned with SPF or DKIM. From May 5, 2025 non-compliant mail goes to Junk; rejection (550 5.7.515) later, date to be announced; the post is inconsistent on that. Recommends an easy visible opt-out, removing invalid addresses regularly to cut bounces and complaints, a valid From or Reply-To, accurate subject lines.

Claims that cite it

• Microsoft requires domains sending more than 5,000 emails a day to Outlook.com, Hotmail and Live addresses to pass SPF and DKIM and publish DMARC of at least p=none aligned with one of them; from May 5, 2025 non-compliant mail goes to Junk, with rejection to follow. It also recommends removing invalid addresses regularly to cut bounces and complaints. (strong)