Why i have this mail in my postqueue:
06713B38095 693 Mon Mar 19 13:39:05 firstname.lastname@example.org
(connect to localhost.localdomain.com[126.96.36.199]: Connection refused)
26763B38094 1546 Mon Mar 19 15:15:31 email@example.com
(Host or domain name not found. Name service error for name=thcpa.com type=MX: Host not found, try again)
if darauz is not a user form thcpa.com (also i delete this domain from ispconfig sites and dnsmanager) he is a user from other domain but with no created DNS AND DNS MX.
But thcpa.com is also the name of the server, under server settings. Can be this the answer to my question? or i have some problems