bypass spam check for local system mail

[Admin Beckspaced]

hello amavis users ;)

i would like to bypass spam checks for local system mail, like fail2ban 
message, logdigest reports, apache and so on ...

all those messages are send via localhost and are listed in @mynetworks

@mynetworks = qw( 127.0.0.0/8 [::1] [FE80::]/10 [FEC0::]/10 10.0.0.0/8 
172.16.0.0/12 192.168.0.0/16 );

then i got a policy_bank for emails originating from mynetworks which 
disables the spam checks via bypass_spam_checks_maps   => [1]

$policy_bank{'MYNETS'} = {   # mail originating from @mynetworks
  originating => 1,  # is true in MYNETS by default, but let's make it 
explicit
  os_fingerprint_method => undef,  # don't query p0f for internal clients
  bypass_spam_checks_maps   => [1],  # don't spam-check
};

but still local messages are getting spam checked! what am i doing wrong?

any hints are highly appreciated - thanks!
becki

2016-09-15T23:33:09.683297+02:00 cx20 postfix/smtpd[3018]: connect from 
localhost.localdomain[127.0.0.1]
2016-09-15T23:33:09.691007+02:00 cx20 postfix/smtpd[3018]: A8A301A06D9: 
client=localhost.localdomain[127.0.0.1]
2016-09-15T23:33:09.696770+02:00 cx20 postfix/cleanup[2875]: 
A8A301A06D9: message-id=<sasbflgubri...@mail.mydomain.com>
2016-09-15T23:33:09.716596+02:00 cx20 postfix/qmgr[25198]: A8A301A06D9: 
from=<spam.pol...@mydomain.com>, size=4327, nrcpt=1 (queue active)
2016-09-15T23:33:09.718564+02:00 cx20 postfix/smtpd[3018]: disconnect 
from localhost.localdomain[127.0.0.1]
2016-09-15T23:33:09.725548+02:00 cx20 postfix/smtpd[3018]: connect from 
localhost.localdomain[127.0.0.1]
2016-09-15T23:33:09.732320+02:00 cx20 postfix/smtpd[3018]: B2B8E1A1A54: 
client=localhost.localdomain[127.0.0.1]
2016-09-15T23:33:09.736469+02:00 cx20 postfix/cleanup[2875]: 
B2B8E1A1A54: message-id=<20160915213248.762df1a1...@mail.mydomain.com>
2016-09-15T23:33:09.848020+02:00 cx20 postfix/qmgr[25198]: B2B8E1A1A54: 
from=<r...@mail.mydomain.com>, size=2769938, nrcpt=1 (queue active)
2016-09-15T23:33:09.852370+02:00 cx20 postfix/smtpd[3018]: disconnect 
from localhost.localdomain[127.0.0.1]
2016-09-15T23:33:09.858719+02:00 cx20 amavis[640]: (00640-15) Passed 
SPAM {RelayedTaggedInternal}, ORIGINATING <r...@mail.mydomain.com> -> 
<ad...@mydomain.com>, Message-ID: <201609
15213248.762df1a1...@mail.mydomain.com>, mail_id: SBFlGuBrI3O6, Hits: 
7.723, size: 2758181, queued_as: B2B8E1A1A54, 21244 ms
2016-09-15T23:33:09.875955+02:00 cx20 postfix/smtp[2879]: 762DF1A1A50: 
to=<ad...@mydomain.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=22, 
delays=0.34/0.02/0.01/21, dsn=2.0.0, statu
s=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued 
as B2B8E1A1A54)
2016-09-15T23:33:09.879476+02:00 cx20 postfix/qmgr[25198]: 762DF1A1A50: 
removed
2016-09-15T23:33:10.665806+02:00 cx20 postfix/lmtp[3020]: A8A301A06D9: 
to=<s...@mydomain.com>, relay=localhost[127.0.0.1]:24, delay=0.98, 
delays=0.03/0.01/0.01/0.93, dsn=2.0.0, statu
s=sent (215 Recipient <s...@mydomain.com> OK)
2016-09-15T23:33:10.666523+02:00 cx20 postfix/qmgr[25198]: A8A301A06D9: 
removed
2016-09-15T23:33:11.877200+02:00 cx20 postfix/lmtp[3022]: B2B8E1A1A54: 
to=<ad...@mydomain.com>, relay=localhost[127.0.0.1]:24, delay=2.1, 
delays=0.12/0.01/0.81/1.2, dsn=2.0.0, status
=sent (215 Recipient <ad...@mydomain.com> OK)
2016-09-15T23:33:11.880079+02:00 cx20 postfix/qmgr[25198]: B2B8E1A1A54: 
removed