you may set "mynetworks_style = host"
see http://www.postfix.org/postconf.5.html#mynetworks_style


Am 18.10.2016 um 21:51 schrieb Sebastian Nielsen:
> Set mynetworks to only contain the IPs or networks of the production server.
> You can use /32 to list single IPs.
> Like:
> mynetworks =,
> etc
> Thus, the server will automatically only permit mail to mydestination (eg,
> the domain that the server is authorative for) since the dev and test server
> will then look like "external" users.
> Note that you will have to remove "permit_authenticated" from your relay
> restrictions.
> -----Ursprungligt meddelande-----
> Från: owner-postfix-us...@postfix.org
> [mailto:owner-postfix-us...@postfix.org] För Mark Holmes
> Skickat: den 18 oktober 2016 21:46
> Till: 'postfix-users@postfix.org' <postfix-users@postfix.org>
> Ämne: Restriction question
> Hi list,
> I'd like to configure Postfix such that I can prevent certain IP's/networks
> from sending email to 'external' recipients. I'm basically trying to set it
> so that our dev and test web application servers can't email any domains
> other than our own - so developers can test email functionality without the
> risk of sending email out to 'real' addresses by mistake. 
> So I need something that says 'if the server is from this IP/network then
> only allow mail to mydomain.net'. Or more likely, something which says
> 'these internal networks can only send to internal recipients, with the
> exception of these IP's which can also send to external recipients' 
> I've done some Googling but can't quite figure the best way to achieve this.
> Grateful for any pointers!
> Many thanks,
> Mark
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