Steps for configuration change password plugin for squirrelmail/Horde/Rainloop using poppassd are:
Download poppassd.c from https://netwinsite.com/poppassd/
Look at poppassd.c and make sure it looks safe
yum -y install gcc gcc poppassd.c -o poppassd -lcrypt mv poppassd /usr/local/bin/ yum -y install xinetd cp /etc/xinetd.d/time-stream /etc/xinetd.d/poppassd
nano /etc/xinetd.d/poppassd Update “service time” to “service poppassd”
disable = no id = poppasswd type = UNLISTED user = root group = root server = /usr/local/bin/poppassd port = 106
systemctl restart xinetd systemctl enable xinetd
Test by doing “telnet localhost 106” that service is started properly or not.
Your poppassd is now installed on Centos 7 system.