Web proxy server - Chapter 25 . Running a Mail Server 683
Chapter 25 . Running a Mail Server 683 Checking Logs All logging information for Exim is written to three log files that can be found in /var/log/exim4: mainlog, rejectlog, and paniclog. 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 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. Table 25-1 Exim Log File Messages Symbol Description Explanation <= Message arrival These entries show messages coming into Exim, generally through SMTP or local IPC. => Message delivery These entries show message deliveries, whether they are to a local mailbox or to a remote host using SMTP or some other transport. -> Additional addresses These entries show delivery to additional in message delivery addresses for messages that have already been delivered to another recipient (and logged with an => entry). ** Delivery failure These entries show permanent delivery errors. Errors such as these indicate that the message has been removed from the mail queue and in most cases a DSN (Delivery Status Notification) has been generated and sent to the original message sender. == Delivery deferral These entries show temporary delivery errors. The system will continue to retry sending these until delivery succeeds, or a permanent failure occurs as a result of a retry timeout.
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