Testing and Troubleshooting
This section contains some generic troubleshooting tips, plus specific information about some
common errors and how to fix them.
Checking Logs
All logging information for Exim is written to three log files that can be found in /var/log/exim4.
The first of these, mainlog, contains log entries for all events, including normal events such as
message deliveries. The second, rejectlog, contains entries for rejected messages. The third,
paniclog, contains information about configuration or other errors, and is usually empty unless
a serious problem has occurred. Every entry in these files generally starts with a timestamp.
Entries in the mainlog will often include a string of 15 characters, such as 1E9PTu-0003jN-QY.
This is the message identifier for the message that the log entry is related to. Immediately after the
message identifier there will generally be a two-character string. Table 25-1 details what those
strings mean.
Entries associated with a message that has not been accepted into the queue will not have the message
identifier or two-character flags. Some samples of these types of entries are included in the
next section.
Logging information for the Courier IMAP and POP daemons is saved to /var/log/mail.log.
Normal entries include LOGIN and LOGOUT messages.
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