Anteater is a log analyser for MTA logfiles (such as those produced by sendmail and postfix). The tool is written in 100% C++ and is very easy to customize. Input, output, and the analysis are modular class objects with a clear interface. Currently, there are modules for reading the syslog format of sendmail and postfix that do up to eight useful analyses and write the result in plain ASCII or HTML, to stdout or to files.
Isoqlog is an MTA log analysis program written in C. It is designed to scan qmail, Postfix, Sendmail, and Exim logfiles and produce usage statistics in HTML for viewing through a browser. It produces a "top domains" statistic according to sender, receiver, total mails, and bytes, and keeps the main domain mail statistics with regard to day's top domain, and top users values for per day, per month, and per year.
pflogsumm.pl is designed to provide an over-view of postfix activity, with just enough detail to give the administrator a "heads up" for potential trouble spots. Reports includes: Total number of messages and bytes; Hosts/Domains; senders and Recipients; per-hour traffic reports; summaries of warnings, fatal errors, and panics; and so on ...
Lire is a pluggable log analyzer. It has analyzers for over 25 log file formats, ranging from Apache WWW log files to iptables firewall logs and CUPS printing logs. Reports are generated in 9 different output formats, ranging from Excel 95 to PDF to HTML, optionally with included graphs.
scanlog reads logfiles generated by CommuniGate Pro and generates parsed output in either plain text or HTML. It is no longer supported by the author, and does not work for recent versions of CGPro. If you are interested in taking over maintenance of the project, please contact the author.
qmailmrtg7 utilizes qmail and tcpserver/multilog's extensive logging capabilities to create mrtg graphs. It efficiently processes the logs (large sites with historical logs of over 100MB can be processed in a few seconds). For qmail it graphs remote/local delivery concurrency, queue size, messages process, bytes transferred, and success/failure delivery status. For tcpserver services like SMTP and POP, it graphs total connections and concurrency. For djbdns, it can graph dnscache and tinydns activity. For ClamAV, it graphs viruses found. For spamassassin it graphs spam emails found.
The Moxy Mail Proxy acts as a mail server for multiple domains, transparently proxying mail to different hosts and/or ports. Mail servers transparently receive mail on non-standard ports (i.e., other than 25), users retain complete control over their mail server, mail bandwidth usage is logged on a per destination or per email address basis, mail can be directed to multiple servers/ports simultaneously, and more.