Logsend is a Unix daemon for email notification of log file changes, having 3 different backends. It watches the log files and periodically mails you the additions (being able to filter them). Logsend comes with a dialog-based configuration tool, as well as a live monitor that allows the users to watch the changes in real time.
SeeYouLater's purpose is to fetch a list of IPs of known spammers and to ban them by putting them in /etc/hosts.deny. /etc/hosts.deny is usually read by xinetd or daemons using tcpwrapper. The software is composed of: the feeder, that looks at SMTP daemon logs for the string ++BAN:IP++ and feeds the database accordindly; and the butcher, that looks at the database and updates /etc/hosts.deny. You may want to run the butcher on a system that has no access to the SMTP logfiles, but you can install both packages on the same system. It has been written to run with Exim.
Tcpblocker is for sites that want to limit the number of times an IP address can connect to a tcpserver controlled service like SMTP within a time period. Each time tcpblock runs, it counts how many connections were made per client IP. If an IP exceeds the configurable maximum number of connections within the configurable time period, then tcpblock outputs a standard deny line that can be used to build a tcp.smtp style file. Combined with a cron job and a run script, tcpblocker can be configured to fit into just about any qmail or tcpserver installation.
stdnoj is a cross-platform C++ class library that includes classes for using portable strings, databases, SMTP, POP, NNTP, arrays, files, directories, logging, email, and sockets. While templates are used, no reliance upon STL or other (traditionally error-prone) technologies has been used, which increases portability between compilers.
mysqmail-postfix-logger is a (very small) daemon that logs all SMTP traffic to an SQL database. It splits the information by domain and user for the From and To fields, making it very easy to count all the SMTP traffic for a given domain name. DTC (Domain Technologie Control) uses it for logging the SMTP traffic.
mysqmail-qmail-pop3d is a replacement for the qmail standard checkpasswd that does authentication via a MySQL table. When done, it sets up two more environment variables, MYSQMAIL_USERNAME and MYSQMAIL_DOMAINNAME. The mysqmail qmail-pop3d replacement will use these variables to do the traffic accounting in the MySQL table for the account.
mysqmail-qmail-logger is a very small daemon that logs SMTP traffic such as successful delivery and relaying to an SQL database. It splits the information by domain and by users in both the to and from fields, which makes it very easy to count all the SMTP traffic for a given domain name.