Which services and processes are useful or not in /etc/inittab, /etc/inetd.conf and /etc/rc.tcpip
http://www.ibm.com/developerworks/aix/tutorials/aix/aix.html
Topics: AIX, System Admin The chrctcp command
The chrctcp command in not documented in AIX, but you can still use it to do nice things, especially when you are scripting. Some examples are:
To enable xntpd in /etc/rc.tcpip, and to start xntpd:
# chrctcp -S -a xntpd
To disable xntpd in /etc/rc.tcpip, and to stop xntpd:
# chrctcp -S -d xntpd
To enable xntpd in /etc/rc.tcpip, but not start xntpd:
# chrctcp -a xntpd
To disable xntpd in /etc/rc.tcpip, but to not stop xntpd:
# chrctcp -d xntpd
For info, since AIX 7.2 TL4 sendmail need to be started, as it's required to send email
Sendmail process is starting using
# startsrc -s sendmail -a "-bd -q30m"