Stopping backscatter with D_REJECT

[Robert Moskowitz]

On 04/14/2017 04:35 AM, Todd D. Taft wrote:
> I'm running amavisd-new on a CentOS 7 system with postfix as my MTA.
>
> I've got amavisd-new set up to run as a pre-queue test in the 
> postfix's master.cf:
> smtp      inet  n       -       n       -       -       smtpd
>  -o smtpd_sasl_auth_enable=yes
>  -o receive_override_options=no_address_mappings
>  -o content_filter=smtp-amavis:127.0.0.1:10024
>  -o smtpd_tls_security_level=may
> smtp-amavis  unix  -    -       y       -       2 smtp
>  -o smtp_data_done_timeout=1200
>  -o disable_dns_lookups=yes
>  -o smtp_send_xforward_command=yes
>
> In my amavisd.conf, I've got it set to reject everything bad:
> $final_virus_destiny = D_REJECT;
> $final_banned_destiny     = D_REJECT;
> $final_spam_destiny = D_REJECT;
> $final_bad_header_destiny = D_REJECT;
>
> However, I've noticed that somehow I'm still generating some 
> backscatter on this server.  (mails from local MAILER-DAEMON going out 
> to alleged spam senders).
>
> Is there a way to stop this?
>
I use:

$final_banned_destiny = D_DISCARD;