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Symptom: Postfix says it has started, but when checked the daemon is not running.
Troubleshooting: Upon deeper investigation, logs reveal an error message like the following:
<timestamp> <hostname> postfix/master[<pid id>]: fatal: 0.0.0.0:smtp: Servname not supported for ai_socktype
Problem: /etc/services file is missing, causing the Postfix master process to exit immediately on startup.
Solution: Reinstall the package iana-etc, or restore the services file from your /etc backup.
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