I searched all file that could contain "127.0.0.1/32"
I cant find it and dont know from where amavis gets the info.

There is something in "/etc/amavis/conf.d/50-user"

------------------
chomp($mydomain = "host.domain");
#@local_domains_maps = 1;
# @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 );
--------------------

where else could i look?

there is no entry there.
here is the the file:
/usr/sbin/amavisd-new-cronjob
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#!/bin/bash

# amavisd-new cronjob helper
#
# Run it as the amavis user
#
# First parameter specifies which cronjob routine to run:
#               sa-sync:        spamassassin fast sync
#               sa-clean:       spamassassin cleanup

test -e /usr/bin/sa-learn || exit 0
test -e /usr/sbin/amavisd-new || exit 0

if [ "$(id --name -u)" != "amavis" ]
then
    echo "Please run this cronjob as user amavis"
    exit 1
fi

set -e
umask 022

if ! perl -MMail::SpamAssassin -e "my \$spamtest = Mail::SpamAssassin->new();
\$spamtest->compile_now (); \$spamtest->{conf}->{use_bayes} ? exit 0 : exit 1"
then
        #bayes is disabled - just exit
        exit
fi

case $1 in
        sa-sync)
                /usr/bin/sa-learn --sync 2>&1 >/dev/null
                ;;
        sa-clean)
                /usr/bin/sa-learn --sync --force-expire 2>&1 >/dev/null
                ;;
        *)
                echo "$0: unknown cron routine $1" >&2
                exit 1
                ;;
esac

exit 0
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