← Back to Cloudflare History
minor✓ Resolved

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

Cloudflare•Mon, Aug 31, 2026, 08:16 PM
Status
resolved
Duration
1h 48m
Updates
3
Coverage
0 articles

INCIDENT TIMELINE

✓ ResolvedMon, Aug 31, 2026, 10:05 PM
This incident has been resolved.
monitoringMon, Aug 31, 2026, 08:49 PM
Some customers using 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. Affected customers should ask their Proofpoint administrator to allowlist notify.cloudflare.com and Cloudflare IPs 104.30.16.2,104.30.16.3,104.30.16.4,104.30.16.5,104.30.16.6, and 104.30.16.7. If this cannot be configured locally, contact Proofpoint for additional support.
identifiedMon, Aug 31, 2026, 08:47 PM
Some customers using 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. Affected customers should ask their Proofpoint administrator to allowlist notify.cloudflare.com and Cloudflare IPs 104.30.16.2,104.30.16.3,104.30.16.4,104.30.16.5,104.30.16.6, and 104.30.16.7. If this cannot be configured locally, contact Proofpoint for additional support.
investigatingMon, Aug 31, 2026, 08:16 PM
Some customers using 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. Affected customers should ask their Proofpoint administrator to allowlist notify.cloudflare.com and Cloudflare IPs 104.30.16.2,104.30.16.3,104.30.16.4,104.30.16.5,104.30.16.6, and 104.30.16.7. If this cannot be configured locally, contact Proofpoint for additional support.

📊 TECHNICAL DETAILS

Internal ID
ad1b9f03-5b50-43ff-b00f-0556393edfda
External ID
72lc3n642lkf
🕐 Started
Mon, Aug 31, 2026, 08:16 PM
🔄 Last Updated
Mon, Aug 31, 2026, 10:05 PM
✓ Resolved
Mon, Aug 31, 2026, 10:05 PM
MINOR
Impact Level
1h 48m
Total Duration
3
Status Updates
Affected Components
Access
REQUEST COVERAGE
No article has been written for this incident yet. When 100 people request coverage, we automatically generate one.
0 / 100 requests100 more needed