Hello, I have this situation in one server I have many domains, normally postfix delivers email direct locally but when user change email hosting, system still sends emails to old server (don't checks mx and delivers locally). I read something about postfix "two instances", but when I set it i have this same error message "Recipient address rejected: User unknown in virtual mailbox table;" (user create new account on new server but doesn't in old server)
What I must change in Postfix to check mx and delivers directly without locally prioritization. Thanks for help
