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Update Stalwart stability check: SMTP transient issue during LoadBalancer transition

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Investigation confirmed all SMTP/IMAP ports working correctly as of 21:00 UTC.
SMTP issue at 20:31 UTC coincided with LoadBalancer IP updates (10.42.1.1 → 178.105.17.239).
External port tests verify correct protocol greetings on all ports.

Co-Authored-By: Paperclip <noreply@paperclip.ing>
This commit is contained in:
CTO Agent 2026-07-13 21:03:26 +00:00
parent 3b4146de65
commit 4ed49fc6b4
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apps/stalwart/STABILITY-CHECK.md
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@ -71,14 +71,20 @@ This repository (`https://forgejo.basicstack.de/basicstack/stack.basicstack.de`)
### Investigation Results (2026-07-13)
**Infrastructure Status**: ✅ ALL VERIFIED WORKING
**Infrastructure Status**: ✅ ALL VERIFIED WORKING (as of 21:00 UTC)
- SMTP (ports 25, 587, 465): Responding with correct ESMTP greeting
- IMAP (ports 143, 993): Responding with correct IMAP greeting
- LoadBalancer external IP: 178.105.17.239 (correct)
- Pod status: Running, 0 restarts
- Pod status: Running, started at 19:26 UTC
- Service configuration: Correct port mappings and selectors verified
- Monitoring: PrometheusRules and ServiceMonitors in place
**User-Reported SMTP Issue**: Client configuration problem (Thunderbird connecting to port 143 instead of 587), not infrastructure issue
**SMTP Issue Timeline (2026-07-13)**:
- 20:16 UTC: LoadBalancer IP updates visible in events (10.42.1.1 → 178.105.17.239)
- 20:31 UTC: User reported SMTP port returning IMAP greeting (Thunderbird error)
- 21:00 UTC: External port tests confirm all ports working correctly with proper greetings
- **Assessment**: Transient issue during LoadBalancer IP transition, now resolved
- **Action Required**: User to retest SMTP sending with fresh client connection
### Architecture Overview