Upcoming Sender Policy Framework Changes for the Okta Email Domain
Last Updated:
Overview
Okta is updating the Sender Policy Framework (SPF) policy for the okta.com email domain from "softfail" to "fail" on July 8, 2026. This change instructs Email Service Providers (ESPs) to reject emails sent from okta.com if they do not originate from a known list of IP addresses. To prevent email delivery failures for auto-forwarded messages or distribution lists, administrators must enable the Sender Rewriting Scheme (SRS) or Authenticated Received Chain (ARC)
Applies To
- Okta Identity Engine (OIE)
- Okta Classic Engine
- Sender Policy Framework (SPF)
okta.comemail domain
Solution
How do the upcoming Sender Policy Framework changes impact auto-forwarded emails?
The strict SPF policy primarily impacts auto-forwarded emails, such as those processed by Distribution Lists (DLs) or user auto-forwarding rules. Enabling the Sender Rewriting Scheme (SRS) or Authenticated Received Chain (ARC) for auto-forwarded emails allows users to receive messages without failing the strict SPF policy. SRS and ARC are solutions designed to resolve email authentication failures caused by message forwarding.
The Sender Rewriting Scheme resolves email authentication failures.
When a server forwards an email, the forwarding server becomes the new sender. If the receiving server enforces SPF policies, the message fails because the original sender's domain does not authorize the forwarder's IP address. The Sender Rewriting Scheme (SRS) resolves this by rewriting the envelope sender address to the forwarding domain, making the forwarder the legitimate origin of the bounce messages.
The Authenticated Received Chain records original authentication results.
Intermediaries such as forwarders, mailing lists, and spam filters often modify email content. Modifications such as adding footers, headers, or changing the subject line break DomainKeys Identified Mail (DKIM) signatures and cause Domain-based Message Authentication, Reporting, and Conformance (DMARC) validation to fail. The Authenticated Received Chain (ARC) resolves this by cryptographically recording the original authentication results before the message is modified. Each hop adds a new digital seal to the chain, allowing the final recipient to verify that the email was originally authenticated at the start of the routing process.
