Log level
The level of logging can be set for
sendmail(1M).
The default using a standard configuration table is level 9. The levels
are as follows:
0-
Minimal logging.
1-
Serious system failures and potential security problems.
2-
Lost communications (network problems) and protocol failures.
3-
Other serious failures, malformed addresses, transient forward/include
errors, connection timeouts.
4-
Minor failures, out of date alias databases, connection rejections
via check_ rulesets.
5-
Message collection statistics.
6-
Creation of error messages, VRFY and EXPN commands.
7-
Delivery failures (host or user unknown, and so on).
8-
Successful deliveries and alias database rebuilds.
9-
Messages being deferred (due to a host being down, for example).
10-
Database expansion (alias, forward, and userdb lookups).
12-
Log all incoming and outgoing SMTP commands.
20-
Logs attempts to run locked queue files. These are not errors, but can
be useful to note if your queue appears to be clogged.
30-
Lost locks (only if using lockf instead of flock).
Additionally, values above 64 are reserved for extremely verbose
debugging output. No normal site would ever set these.
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