Workgroup Manager will allow you to create users named "postmaster," "abuse," and other things that conflict with common server mail aliases. Because of their traditional purposes, users with the following names will not be able to receive email in the default configuration. The server will receive the mail, but the user won't. These names are:
The file /etc/postfix/aliases defines these names as redirected to root, and root's email is directed to /dev/null. Avoid using these names unless the user will be acting in the traditional role expected of the corresponding address. To allow any of the above user names to receive email, comment out (add "#" before a line) the appropriate line in /etc/postfix/aliases. For example:
# Well-known aliases # manager: root # dumper: root # operator: root # abuse: postmaster
Next, execute these commands in the Terminal:
newaliases postfix reload
These commands will reload the alias database and the mail server.