AWStats is a free powerful tool that generates advanced web, streaming, ftp or mail server statistics, graphically. This log analyzer works as a CGI or from command line and shows you all possible information your log contains, in few graphical web pages. It uses a partial information file to be able to process large log files, often and quickly. It can analyze log files from all major server tools like Apache log files (NCSA combined/XLF/ELF log format or common/CLF log format), WebStar, IIS (W3C log format) and a lot of other web, proxy, wap, streaming servers, mail servers and some ftp servers.
You can easily configure awstats under Lighttpd web server.
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Most mail servers are tight on resources. The Postfix system is designed to run within a finite memory budget. These limits are imposed on each and every user to avoid resource exhaustion. The idea is pretty simple, keep mail server running under conditions of stress, without making the problem worse.
However some time user sends large attachment and these are rejected by Postfix. The message_size_limit sets the maximal size of a postfix queue file, including envelope information (sender, recipient, etc.). The default is 10240000 bytes. You may see an error message in maillog file:
Sep 21 17:03:53 p5smtp22 postfix/postdrop: warning: uid=2012: Illegal seek
Sep 21 12:03:53 p5smtp22 postfix/sendmail: fatal: reports(2012): queue file write error
Postfix version 2.3 or olders reports “illegal seek” instead of “file too large” error. There are two ways to fix this problem:
- First upgrade Postfix to latest stable version such as 2.5
- Set message_size_limit parameter
Open /etc/postfix/main.cf config file:
# vi /etc/postfix/main.cf
Set message_size_limit to 20971520 bytes (20 megabytes):
message_size_limit = 20971520
Restart postfix mail server:
# /etc/init.d/postfix restart