Hello, My problem: ISPconfig work well for several month with couple domains. But all domains users can receive emails [email protected] -> user1 [email protected] -> user1 [email protected] -> user1 I read the manual about not to add the virtual host in postfix main.cf myhostname entry. But still can't understand what should I enter for myhostname and mydomain? For example I have: 10 domains ( domain1.tld domaind2.tld ... domain10.tld ) I entered in myhostname = domain1.tld, but it's wrong ? Every domain has the virtual site for it. Please explain how to configure myhostname properly what emails would work onlu for domain users, not for all system uzers. Thank you for your time and help! P.S cat /etc/postfix/local-host-names ################################### # # ISPConfig local-host-names Configuration File # Version 1.0 # ################################### localhost domain.tld ( changed to domain.tld ) localhost.domain.tld localhost.tld other_domains.tld cat /etc/hosts 127.0.0.1 localhost x.x.x.x domain1.tld domain1 cat /etc/hostname domain1