Implementation checklist
- Confirm SPF, DKIM, and DMARC pass for the filtered message.
- Compare subject/body against providers' bulk mail guidance.
- Reduce sudden send-volume spikes where possible.
- Check organization-level allowlists and quarantine policy.
- Ask IT/admin to review mailbox-side rules and reputation signals.
Why this still happens
Authentication verifies sender identity, but inbox placement also depends on trust and engagement signals.
If filtering continues
Coordinate with your mail administrator to adjust sender trust settings and monitor changes after each adjustment.