Email deliverability: authentication alignment and sending-path coherence

Problem

Outbound mail showed spam-folder and inconsistency symptoms tied to authentication gaps and DNS drift relative to the sending tools in use. The team needed a precise picture of what was broken and a safe order of fixes—not another generic “warm up the domain” checklist.

Approach

Review DNS and the full sending path: SPF, DKIM, DMARC, and alignment with real from/subdomain behavior. Reconcile records with the actual sending configuration, then validate after changes using the same signals mailbox providers evaluate.

Outcomes

• Authentication and DNS brought back into alignment with the live sending setup
• A focused validation pass after changes to confirm the stack reads cleanly
• Clear handoff notes for when new tools or subdomains change the sending path again

Notes

Technical mechanism described; no promise of a specific spam-folder outcome.