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Log Level
sendmail provides a comprehensive error- and event-logging capability. The L (log level) option in the configuration file determines the level of detail written to the log. The default value for the log level is 1; valid levels are as follows:
- 0
- no logging
- 1
- major problems only
- 2
- message collections and failed deliveries
- 3
- successful deliveries
- 4
- messages being deferred (because a host is down, for example)
- 5
- normal message queue-ups
- 6
- unusual but benign incidents, such as trying to process a locked queue file
- 9
- log internal queue ID to external message ID mappings; useful for tracing a message as it travels among several hosts
- 12
- several messages of interest when debugging
- 16
- verbose information regarding the queue
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