diff --git a/apps/stalwart/STABILITY-CHECK.md b/apps/stalwart/STABILITY-CHECK.md
index e556b3a..382692e 100644
--- a/apps/stalwart/STABILITY-CHECK.md
+++ b/apps/stalwart/STABILITY-CHECK.md
@@ -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