I've got a personal project on the back burner to parse the logfile emails I receive from my d-link router at home. In my notes I have earmarked a few modules to help me write this when I get around to it. You may find these modules helpful:

SyslogScan contains routines to parse system logs. The package includes a sample application, read_mail_log.pl, which can print out various statistics about mail sent and received.

Parse::Syslog - Parse Unix syslog files

DBD::File - Base class for writing DBI drivers for plain files

AnyData::Format::Text - I thought there was an AnyData::Format::Syslog module but I was wrong...

HTH