23.3. Enable IMAP or POP via the tcp-wrappers inetd super server

Edit the inetd.conf file, vi /etc/inetd.conf and add or uncomment the line related to the service you want to enable. If you want to use IMAP then uncomment the line related to it, if is POP that you want to use in your server, then uncomment it instead of IMAP. In our example below we'll use IMAP service.

#pop-2 stream tcp nowait root /usr/sbin/tcpd ipop2d #pop-3 stream tcp nowait root /usr/sbin/tcpd ipop3d imap stream tcp nowait root /usr/sbin/tcpd imapd

Don't forget to update your inetd.conf file by sending a SIGHUP signal killall -HUP inetd after adding or uncommenting the corresponding line.

[root@deep /root]# killall -HUP inetd

If the IMAP/POP server you want to install is a private and limited server for wheel knows real IP address clients, you can use the security feature of tcp-wrappers to control, which can connect, to your server and from where. If you intended to offer mail service to a dial-up clients or a Webmail service for example, then you cannot use this feature. Edit the hosts.deny file, vi /etc/hosts.deny and add the line:

ALL: ALL@ALL, PARANOID

Which means all services, all locations, so any service not explicitly allowed is then blocked, unless they are permitted access by entries in the hosts.allow file.

Edit the hosts.allow file, vi /etc/hosts.allow and add the line:

imapd: 216.209.228.34 my.domain.com

Which mean only client IP 216.209.228.34 with host name my.domain.com is allowed to connect and use IMAP service on the server.