Qmail is a simple message transfer agent. It is meant as a replacement for the entire sendmail-binmail system on typical Internet-connected UNIX hosts. It offers POP3, and support for mail retrieval.
eG Enterprise provides a specialized model for monitoring the health of a Qmail server. This model execute tests on the Qmail server at pre-configured intervals, and report plenty of useful performance metrics which reveal the availability of the Qmail server, time taken by the server to send/receive mails, the health of critical internal components and services offered by the Qmail server, the effectiveness of the protocols employed while mailing, etc.