Cloudflare Access one-time PIN emails blocked by certain email security gateways, including Proofpoint

Summary

Cloudflare Access one-time PIN emails blocked by certain email security gateways, including Proofpoint

This incident has been resolved.

• Started

  Sep 1, 2026 · 8:06 PM

• Resolved

  Sep 2, 2026 · 7:16 AM

• Duration

  11h 9m

• Severity

  Minor

• ◐

  Investigating

  Sep 1 · 8:06 PM Cloudflare

  Some customers using email security gateway like Proofpoint may experience delayed Cloudflare notifications and login codes. Proofpoint is temporarily deferring messages with an SMTP 421 4.7.0 response. Cloudflare will continue retrying delivery.

• ✓

  Resolved

  Sep 2 · 7:16 AM Cloudflare

  This incident has been resolved.