Troubleshooting Email Delivery to Microsoft Users

https://rozumem.xyz/posts/14

Article

  • Documents the opaque, frustrating process of getting emails unblocked by Microsoft/Outlook
  • Covers SNDS, SPF/DKIM/DMARC setup, and Microsoft’s JMRP/SNDS tools
  • Argues Microsoft’s deliverability standards push small senders toward Office 365

Discussion

  • Multiple commenters report permanent SNDS blocks with no recourse despite clean sending
  • Key rule broken: mixing marketing and transactional email on same IP/domain
  • Microsoft seen as deliberately opaque to drive O365 adoption; Gmail less strict
  • “Victim blaming” framing criticized; infrastructure-level blocks ignore subdomain separation

Discuss on HN


Type Link
Added Apr 15, 2026
Modified Apr 15, 2026