When you need to change the local_recipient_maps setting in main.cf

• Problem: you don't use the default Postfix local(8) delivery agent for domains matching $ mydestination, $ inet_interfaces, or $ proxy_interfaces. For example, you redefined the " local_transport" setting in main.cf.

  Solution: your local_recipient_maps setting needs to specify a database that lists all the known user names or addresses for that delivery agent. For example, if you deliver users in $ mydestination etc. domains via the virtual(8) delivery agent, specify:

  /etc/postfix/main.cf
      
  mydestination = $
  myhostname localhost.$
  mydomain localhost ...
      
  local_transport = virtual
      
  local_recipient_maps = $
  virtual_mailbox_maps
  

  If you use a different delivery agent for $ mydestination etc. domains, see the section " Local recipient table format" below for a description of how the table should be populated.

• Problem: you use the mailbox_transport or fallback_transport feature of the Postfix local(8) delivery agent in order to deliver mail to non-UNIX accounts.

  Solution: you need to add the database that lists the non-UNIX users:

  /etc/postfix/main.cf
      
  local_recipient_maps = 
  proxy:unix:passwd.byname, $
  alias_maps,
          <the database with non-UNIX accounts>
  

  See the section " Local recipient table format" below for a description of how the table should be populated.

• Problem: you use the luser_relay feature of the Postfix local delivery agent.

  Solution: you must disable the local_recipient_maps feature completely, so that Postfix accepts mail for all local addresses:

  /etc/postfix/main.cf
      
  local_recipient_maps =