🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: RHEL 10.0 RHEL 10.1

📖 ~1 min read

Table of contents
  1. Problem Summary
  2. Symptoms
  3. Diagnostics
  4. Root Cause
  5. Primary Fix
  6. Verification
  7. Prevention
  8. Rollback
  9. Automation
  10. Command Reference
  11. Escalation
  12. Related Notes

Problem Summary

Mail relay attempts fail due to SELinux denials in postfix context.

Symptoms

Queue grows and logs show permission denied despite correct credentials.

Diagnostics

Use ausearch -m AVC and journalctl -u postfix to correlate failures.

Root Cause

Missing SELinux boolean or mislabeled certificate/key files.

Primary Fix

Enable required boolean and restorecon on postfix TLS assets.

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Illustrative mockup for rhel-10 — rhel10-b02-p43-1
Illustrative mockup — Progressive Robot — Illustrative mockup — Progressive Robot

Verification

Send test mail and verify queue flush without AVC entries.

Illustrative mockup for rhel-10 — rhel10-b02-p43-2
Illustrative mockup — Progressive Robot — Illustrative mockup — Progressive Robot

Prevention

Include SELinux context checks in mail server hardening.

Rollback

Revert recent policy customizations if mail flow regresses.

Automation

Apply postfix and SELinux settings using repeatable role.

Command Reference

setsebool -P; restorecon -Rv /etc/postfix; postqueue -p

Escalation

Share AVC logs and postfix main.cf excerpts.

Temporary permissive mode should be used only for diagnostics.

Related tutorial: View the step-by-step tutorial for rhel-10.

View all rhel-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

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