You have your permit_sasl_authenticated inside smtpd_sender_restrictions right?
Replace that with "check_sender_access hash:/path/to/file"

Inside the file /path/to/file, you add the following:
mydomain.com permit_sasl_authenticated, reject

Essentially, you move your "permit_sasl_authenticated" to the /path/to/file 
file.

Or do you already have a check_sender_access containing 
permit_sasl_authenticated?

-----Ursprungligt meddelande-----
Från: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] 
För Phil Stracchino
Skickat: den 17 november 2016 15:10
Till: postfix-users@postfix.org
Ämne: Re: block emails which pretend to originate from my domain

On 11/17/16 04:47, Sebastian Nielsen wrote:
> Put check_sender_access hash:/path/to/file INSTEAD of 
> permit_sasl_authenticated in global config.
> 
> in "/path/to/file", put mydomain.com permit_sasl_authenticated, reject

In check_sender_access, in smtpd_sender_restrictions, or does it not matter 
which of the two?


--
  Phil Stracchino
  Babylon Communications
  ph...@caerllewys.net
  p...@co.ordinate.org
  Landline: 603.293.8485

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