Open relay from localhost and other questions

Robert Moskowitz rgm at
Mon Apr 24 16:49:29 CEST 2017

On 04/22/2017 08:14 AM, Dominic Raferd wrote:
> On 22 April 2017 at 00:00, Benny Pedersen <me at 
> <mailto:me at>> wrote:
>     Robert Moskowitz skrev den 2017-04-21 21:16:
>         Been doing some research.  mynetworks should stop the
>         localhost from
>         seeming like an Open relay.  I don't have this problem on my old
>         production server.  I am researching it.
> If mynetworks is undefined then it takes its value according to 
> mynetworks_style and the default for this setting changed for Postfix 
> 3.0 - see 
> Perhaps this could explain the difference you are seeing.
> However external authenticated senders are not local (and I don't 
> trust any non-authenticated senders outside the host) so in such a 
> case the message from amavis is correct ('Nonlocal recips but not 
> originating') while the warning ('Open relay?') is unnecessary.

Well, no mynetworks_style in either postfix, and both are < 3 (2.6 and 
2.10) so it defaults to subnet, even though in postfix, I DO have a 
postfix mynetworks:

config_directory = /etc/postfix
mynetworks = $config_directory/mynetworks

# cat /etc/postfix/mynetworks
# This specifies the list of subnets that Postfix considers as
# "trusted" SMTP clients that have more privileges than "strangers".
# In particular, "trusted" SMTP clients are allowed to relay mail
# through Postfix.
# Be sure to add your public ip address block if needed.

But this shouldn't be the problem, as the mail is originating from 
'host' in these tests.

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