Hi all, im little bit confused, i try solve problem with some of my domains i try slowly explain problem. I have website for domainX on server1 and mailserver for this domain is exchange on server2 mailusers on server1.* try to send mail to domainX and there is problem When try this another users from server3.* all is ok transport work as i want. I search this forum for relative topics, i have set on all subdomains and domainX mailserver to external. MX Checkbox in site is unchecked i try add mx record in dns manager server1 points to my server2 ip but when i send mail using webmail from server1.domainY addresed to user.domainX mail returns with this debug message Action: failed Status: 5.4.6 Diagnostic-Code: X-Postfix; mail for server1.domainX loops back to myself Any idea how to set this correctly?