Hello, I want to remove a domain (actually two entries: dummy.com & www.dummy.com) in the /etc/postfix/local-host-names. [My server only host the website of this dummy.com. The DNS and email of this dummy.com will be handled by external servers.] I manually edit the files 'local-host-names' and 'local-host-names~' under /etc/postfix . After removing the domain entries, the system work as my expect, the emails for dummy.com are sent to the external email server. But after serval minutes, the deleted domain entries are recovered in the files again. How to solve it? Many thanks.