Outage in Cloudflare
Cloudflare Access one-time PIN emails blocked by certain email security gateways, including Proofpoint
Resolved MinorIncident Report
Summary AI Generated
Cloudflare Access one-time PIN emails were delayed for customers using Proofpoint, which was temporarily blocking delivery with an SMTP 421 4.7.0 deferral response over a ~1.8-hour window. This prevented affected users from receiving login codes and notifications via Cloudflare Access. The resolution required Proofpoint administrators to allowlist Cloudflare's sending domain and IPs, with Cloudflare continuing to retry delivery in the interim.
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.
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Latest Updates ( sorted recent to last )
MONITORING
about 15 hours ago - at 08/31/2026 08:49PM
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.
IDENTIFIED
about 15 hours ago - at 08/31/2026 08:47PM
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.
INVESTIGATING
about 15 hours ago - at 08/31/2026 08:16PM
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.
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