Chapter 14. Signals, Transactions, and Syslog
The sendmail program can keep the system administrator up-to-date about many aspects of mail delivery and forwarding. It does this by logging its activities using the syslog(3) facility. Information about things such as total message volume and site connectivity can help the administrator make sendmail more efficient. Information about the SMTP dialog that was used to send the message can help the administrator solve delivery problems.
In this chapter, we cover three important aspects of
sendmail. First, we explain how signals
interact with sendmail and show how signals can
be used to cause sendmail to log additional
information. Second, we show how to use the -X command-line switch to cause
sendmail to record its SMTP
transactions. Finally, we explain the use of the
syslog(3) facility, illustrate several
ways to tune its output, and describe the meaning of that
output.
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