Marcelo Machado:
> I agree with everyone. Not a good idea but the customer is insisting on it.
> 
> I will see what I can do. If anyone knows how to do this please help me.

The request appears to be a classical example of the XY problem:
asking for help to implement the wrong solution.

Speaking of which, smtpd_recipient_limit is not a per-user or
per-domain feature, therefore the options are:

- Configure master.cf with a dedicated smtpd service for this customer,
  and point their systems to this service:

  1.2.3.4:smtp      inet  n       -       n       -       -       smtpd
      -o smtpd_recipient_limit=1

  This requires adding an IP address alias to the host.

- Configure a Milter to enforce a recipient count for mail from
  this customer.

- Configure some content filter to enforce a recipient count for
  mail from this customer.

        Wietse

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