Other Diagnostic Information

For other diagnostic information, check the following sources:

• Look at the Received lines in the header of the message. These lines trace the route the message took as it was relayed. Notice that in the UUCP network many sites do not update these lines, and in the Internet the lines often get rearranged. To straighten them out, look at the date and time in each line. Remember to account for time-zone differences.

• Look at the messages from MAILER-DAEMON. These typically report delivery problems.

• Check the system log that records delivery problems for your group of systems. The sendmail program always records what it is doing in the system log. You might want to modify the crontab file to run a shell script nightly that searches the log for SYSERR messages and mails any that it finds to the postmaster.

• Use the mailstats program to test mail types and determine the number of incoming and outgoing messages.