Roundcube Login Failed? The REAL Fix (Dovecot + MySQL + PHP-FPM) Working in 30 Minutes!
#Roundcube #Webmail #PHPFPM #Dovecot #Postfix #MySQL #LinuxServer #Nginx #Apache #EmailServer
Roundcube Login Failed? UI Not Loading? In this real-world troubleshooting session, we fix the most common (and most frustrating) Roundcube Webmail problems: login rejected, blank/white page, and UI not displaying and the root cause is often PHP-FPM, Dovecot database permissions, or Postfix authentication pointing to the wrong user source.
In this video you’ll learn how to diagnose and solve:
✅ Roundcube UI not loading → check PHP-FPM service first
✅ Login rejected / authentication failed → fix Dovecot ↔ MySQL access
✅ Postfix mapping Linux users instead of MySQL users → switch to database-backed virtual users
✅ Apache vs Nginx for Roundcube → when switching to Nginx helps stability
✅ MariaDB install conflicts → why official installation docs save hours
✅ Local install problems (Nginx/Apache port conflicts) → why server-side setup is cleaner
✅ Why MySQL is better than PostgreSQL for fast, disposable experimental setups
✅ How to keep your mail system simple, debuggable, and production-ready
🔥 What we’re building (the bigger goal)
This setup is part of a practical workflow to receive emails, mark spam in a web UI, and support a Feedback Loop (FBL) pipeline for collecting spam signals. If you’re working on email deliverability, spam reporting, or mail server automation, this will save you a ton of time.
⏱️ Chapters (optional but recommended)
00:00 Roundcube UI + login rejected (the symptoms)
03:00 Database users vs Linux users (the hidden cause)
12:50 UI not showing → PHP-FPM fix
16:30 Apache vs Nginx decision
29:00 MariaDB conflicts + documentation mistakes
44:00 Local machine conflicts (Nginx vs Apache / ports)
1:00:00 Why MySQL for testing + keep systems simple
1:19:00 Reduce components (simple system = easier troubleshooting)
✅ Quick checklist (pin this)
Check php-fpm status (service running + correct version)
Confirm Roundcube points to correct IMAP/SMTP endpoints
Verify Dovecot can read MySQL (user permissions + socket/host)
Ensure Postfix uses virtual mailbox users from DB (not Linux users)
Avoid local conflicts: don’t run Apache + Nginx on same port
Follow official install docs (not only wiki)
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If this helped, like, subscribe, and comment “ROUND CUBE FIXED” so I can share the exact debugging checklist I use for mail systems.
#SysAdmin #Troubleshooting #DevOps #MailServer #EmailDeliverability