## Context (bd code-yiu)
With Phase 4+5 proven (external mail flows through pfSense HAProxy +
PROXY v2 to the alt PROXY-speaking container listeners), the MetalLB
LoadBalancer Service + `10.0.20.202` external IP + ETP:Local policy are
obsolete. Phase 6 decommissions them and documents the steady-state
architecture.
## This change
### Terraform (stacks/mailserver/modules/mailserver/main.tf)
- `kubernetes_service.mailserver` downgraded: `LoadBalancer` → `ClusterIP`.
- Removed `metallb.io/loadBalancerIPs = "10.0.20.202"` annotation.
- Removed `external_traffic_policy = "Local"` (irrelevant for ClusterIP).
- Port set unchanged — the Service still exposes 25/465/587/993 for
intra-cluster clients (Roundcube pod, `email-roundtrip-monitor`
CronJob) that hit the stock PROXY-free container listeners.
- Inline comment documents the downgrade rationale + companion
`mailserver-proxy` NodePort Service that now carries external traffic.
### pfSense (ops, not in git)
- `mailserver` host alias (pointing at `10.0.20.202`) deleted. No NAT
rule references it post-Phase-4; keeping it would be misleading dead
metadata. Reversible via WebUI + `php /tmp/delete-mailserver-alias.php`
companion script (ad-hoc, not checked in — alias is just a
Firewall → Aliases → Hosts entry).
### Uptime Kuma (ops)
- Monitors `282` and `283` (PORT checks) retargeted from `10.0.20.202`
→ `10.0.20.1`. Renamed to `Mailserver HAProxy SMTP (pfSense :25)` /
`... IMAPS (pfSense :993)` to reflect their new purpose (HAProxy
layer liveness). History retained (edit, not delete-recreate).
### Docs
- `docs/runbooks/mailserver-pfsense-haproxy.md` — fully rewritten
"Current state" section; now reflects steady-state architecture with
two-path diagram (external via HAProxy / intra-cluster via ClusterIP).
Phase history table marks Phase 6 ✅. Rollback section updated (no
one-liner post-Phase-6; need Service-type re-upgrade + alias re-add).
- `docs/architecture/mailserver.md` — Overview, Mermaid diagram, Inbound
flow, CrowdSec section, Uptime Kuma monitors list, Decisions section
(dedicated MetalLB IP → "Client-IP Preservation via HAProxy + PROXY
v2"), Troubleshooting all updated.
- `.claude/CLAUDE.md` — mailserver monitoring + architecture paragraph
updated with new external path description; references the new runbook.
## What is NOT in this change
- Removal of `10.0.20.202` from `cloudflare_proxied_names` or any
reserved-IP tracking — wasn't there to begin with. The
`metallb-system default` IPAddressPool (10.0.20.200-220) shows 2 of
19 available after this, confirming `.202` went back to the pool.
- Phase 4 NAT-flip rollback scripts — kept on-disk, still valid if
someone re-introduces the MetalLB LB (see runbook "Rollback").
## Test Plan
### Automated (verified pre-commit 2026-04-19)
```
# Service is ClusterIP with no EXTERNAL-IP
$ kubectl get svc -n mailserver mailserver
mailserver ClusterIP 10.103.108.217 <none> 25/TCP,465/TCP,587/TCP,993/TCP
# 10.0.20.202 no longer answers ARP (ping from pfSense)
$ ssh admin@10.0.20.1 'ping -c 2 -t 2 10.0.20.202'
2 packets transmitted, 0 packets received, 100.0% packet loss
# MetalLB pool released the IP
$ kubectl get ipaddresspool default -n metallb-system \
-o jsonpath='{.status.assignedIPv4} of {.status.availableIPv4}'
2 of 19 available
# E2E probe — external Brevo → WAN:25 → pfSense HAProxy → pod — STILL SUCCEEDS
$ kubectl create job --from=cronjob/email-roundtrip-monitor probe-phase6 -n mailserver
... Round-trip SUCCESS in 20.3s ...
$ kubectl delete job probe-phase6 -n mailserver
# pfSense mailserver alias removed
$ ssh admin@10.0.20.1 'php -r "..." | grep mailserver'
(no output)
```
### Manual Verification
1. Visit `https://uptime.viktorbarzin.me` — monitors 282/283 green on new
hostname `10.0.20.1`.
2. Roundcube login works (`https://mail.viktorbarzin.me/`).
3. Send test email to `smoke-test@viktorbarzin.me` from Gmail — observe
`postfix/smtpd-proxy25/postscreen: CONNECT from [<Gmail-IP>]` in
mailserver logs within ~10s.
4. CrowdSec should still see real client IPs in postfix/dovecot parsers
(verify with `cscli alerts list` on next auth-fail event).
## Phase history (bd code-yiu)
| Phase | Status | Description |
|---|---|---|
| 1a | ✅ `ef75c02f` | k8s alt :2525 listener + NodePort Service |
| 2 | ✅ 2026-04-19 | pfSense HAProxy pkg installed |
| 3 | ✅ `ba697b02` | HAProxy config persisted in pfSense XML |
| 4+5 | ✅ `9806d515` | 4-port alt listeners + HAProxy frontends + NAT flip |
| 6 | ✅ **this commit** | MetalLB LB retired; 10.0.20.202 released; docs updated |
Closes: code-yiu
43fe11fffc