Topic starter
25/10/2026 11:08 am
TL;DR: Broken SPF or DKIM can now stop legitimate support email from becoming tickets, according to EasyDMARC. Support queues need DMARC visibility, clean SPF records, and durable DKIM signing to keep forwarded mail from disappearing.
Editorial analysis by NHI Mgmt Group, based on content published by EasyDMARC: “Broken SPF or DKIM? Your Emails to Zendesk Support Desks May Never Arrive”.
By the numbers:
- Zendesk says the rollout starts on June 18 2026, with eligible accounts moved from September 23, 2026.
- EasyDMARC says 52.1% of the top 1.8 million domains have a valid DMARC record.
Key questions
Q: Why do forwarded emails fail authentication more often than direct sends?
A: Forwarding changes the path that SPF evaluates, so the forwarder’s IP can invalidate the original sender’s alignment.
Q: How can security teams tell whether email authentication is enough?
A: It is not enough when the sender account, domain, and communication style can all be genuine.
Q: What breaks when support platforms enforce sender authentication but SPF or DKIM is misconfigured?
A: Legitimate mail can be suspended before it becomes a ticket, even when the sender believes delivery succeeded.
Practitioner guidance
- Fix DKIM on every active mail stream Sign each sending source with DKIM on your own domain, including application mail, service desks, and agent mailboxes, so forwarded messages still have a durable authentication signal.
- Rebuild SPF around live senders only Remove obsolete services, stay below the 10 DNS lookup limit, and verify that every authorised sender passes in production rather than only on paper.
- Inspect the Suspended tickets view daily Sort by suspension reason and watch for repeated authentication failures, because Zendesk accepts the mail and hides it from the active queue instead of bouncing it.
Bottom line: Email authentication is no longer only about inbox reputation. It now decides whether some support requests become tickets at all.
Glossary terms: SPF, Email Authentication, DKIM, ARC
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This topic was modified 7 days ago by NHI Mgmt Group
27/10/2026 7:18 pm
Support inbox authentication is becoming an intake control, not just a mail hygiene setting. Once a platform decides whether a message becomes a ticket based on SPF, DKIM, DMARC, and ARC, the identity proofing question shifts from inbox delivery to service access. That is a governance change, because availability of customer communications now depends on the quality of sender identity signals rather than simple receipt. Practitioners should treat this as part of identity and access design, not an email-only concern.
A question worth separating out:
Q: Should organisations enable stricter inbound mail checks before every sender is fully aligned?
A: Not usually. Stricter checks are best introduced only after you know which systems send mail, how forwarding behaves, and whether DKIM survives every path. Otherwise, a well-meant control can break customer communication, internal alerts, and agent replies at the same time.
👉 Read our full editorial: Zendesk sender authentication raises the bar for support inbox deliverability
This post was modified 7 days ago by NHI Mgmt Group