#### 3.2.14 Server Settings ¶

GNU Mailutils offers several server applications: `pop3d`, `imap4d`, `comsatd`, to name a few. Being quite different in their purpose, they are very similar in some aspects of their architecture. First of all, they all support two operating modes: daemon, where a program disconnects from the controlling terminal and works in background, and inetd, where it remains in foreground and communicates with the remote party via standard input and output streams. Secondly, when operating as daemons, they listen to a preconfigured set of IP addresses and ports, reacting to requests that arrive.

To configure these aspects of functionality, GNU Mailutils provides Server Configuration Settings, which is describes in this subsection.