[QUOTE=falko]First you must make sure that your domains and subdomains point to the correct IP address. Therefore you must change the DNS records. The responsible nameservers for puspakom.net.ms are ns5.idnscan.net, ns6.idnscan.net, ns1.idnscan.net, and ns2.idnscan.net.
MZO : Falko, I think I know how the error occour:
Feb 5 00:27:52 server postfix/smtp: 619802EE789: to=<firstname.lastname@example.org>, relay=none, delay=1432, status=deferred (connect to puspakom.net.ms[188.8.131.52]: Connection timed out)
MZO : I register puspakom.net.ms to joynic.com, that why my postfix/smtp point to 184.108.40.206. Which file do I need to edit if I want to change my postfix/smtp setting from puspakom.net.ms to my public IP? I think the problem will solve after I change puspakom.net.ms to my public ip in smtp/postfix.Tq.