How to prevent users from receiving email

[Giorgos Keramidas]

On 2006-08-19 19:21, Bill Moran <wmoran at collaborativefusion.com> wrote:
> 
> Apparently my memory is useless and I've lost the ability to use
> google as well.
> 
> I just added a user account to a mail server, but I don't want that
> user to receive mail on that server.  It's running Postfix.
> 
> I seem to remember a canonical method for preventing certain users
> from receiving email.  But my memory has failed, and I can't seem
> to find anything on google.
> 
> Is it an /etc/aliases trick?

You can use the Postfix `access' map for this.  You can enable an
`access' map in Postfix by setting in your `main.cf' file:

    smtpd_client_restrictions = \
        check_client_access hash:/usr/local/etc/postfix/access

Then, in `/usr/local/etc/postfix/access' put:

    user at domain			 REJECT

and run `postmap' on the `access' file:

    # postmap /usr/local/etc/postfix/access

Reload Postfix and off you go :-)

There are other reject options too, which offer more fine-grained
control of the SMTP error codes and the text of the error messages
Postfix will return.  See, for example:

    http://www.postfix.org/access.5.html