Mails von Hosts im eigenen Netzwerk werden gebounced

[Andreas]

Hallo zusammen,

von einem Host, der im selben Netz 192.168.1.0/24 sich befindet will ich mit 
echo "Ich bin der Nachrichtentext" | mail -s"Testmail" info at example.tld
eine Mail über mx.example.tld versenden.
Die wird aber gebounced, wi edas Log auf neckar zeigt.

Oct 28 19:39:56 neckar postfix/error[35499]: B5F73400BD: 
to=<systemmails at example.tld>, relay=none, delay=0, delays=0/0/0/0, dsn=5.0.0, 
status=bounced (mx.example.tld)

Ich finde in der main.cf des Mailservers keinen Grund, warum die Mails von 
Hosts im eigenen Netzwerk abgelehnt werden sollten.

Grüße

Andreas

main.cf auf mx.example.tld (RElayhost):

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
bounce_queue_lifetime = 1h
broken_sasl_auth_clients = yes
compatibility_level = 2
disable_vrfy_command = yes
greylist = permit_dnswl_client list.dnswl.org, check_policy_service inet:
127.0.0.1:10023
html_directory = /usr/share/doc/postfix/html
inet_interfaces = all
inet_protocols = all
mailbox_size_limit = 0
maximal_backoff_time = 15m
maximal_queue_lifetime = 1h
message_size_limit = 26214400
milter_default_action = accept
milter_protocol = 6
minimal_backoff_time = 300s
mydestination = mx.example.tld, localhost.example.tld, localhost
myhostname = mx.example.tld
mynetworks = 127.0.0.0/8 192.168.1.0/24 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = /etc/mailname
non_smtpd_milters = inet:127.0.0.1:12248
plaintext_reject_code = 550
postscreen_access_list = permit_mynetworks, cidr:/etc/postfix/
postscreen_access.cidr
postscreen_bare_newline_enable = no
postscreen_blacklist_action = drop
postscreen_cache_cleanup_interval = 24h
postscreen_cache_map = proxy:btree:$data_directory/postscreen_cache
postscreen_dnsbl_action = drop
postscreen_dnsbl_sites = b.barracudacentral.org=127.0.0.2*7 
dnsbl.inps.de=127.0.0.2*7 bl.mailspike.net=127.0.0.2*5 
bl.mailspike.net=127.0.0.[10;11;12]*4 dnsbl.sorbs.net=127.0.0.10*8 
dnsbl.sorbs.net=127.0.0.5*6 dnsbl.sorbs.net=127.0.0.7*3 
dnsbl.sorbs.net=127.0.0.8*2 dnsbl.sorbs.net=127.0.0.6*2 
dnsbl.sorbs.net=127.0.0.9*2 zen.spamhaus.org=127.0.0.[10;11]*8 
zen.spamhaus.org=127.0.0.[4..7]*6 zen.spamhaus.org=127.0.0.3*4 
zen.spamhaus.org=127.0.0.2*3 hostkarma.junkemailfilter.com=127.0.0.2*3 
hostkarma.junkemailfilter.com=127.0.0.4*1 
hostkarma.junkemailfilter.com=127.0.1.2*1 wl.mailspike.net=127.0.0.
[18;19;20]*-2 hostkarma.junkemailfilter.com=127.0.0.1*-2
postscreen_dnsbl_threshold = 8
postscreen_dnsbl_ttl = 5m
postscreen_greet_action = enforce
postscreen_greet_banner = $smtpd_banner
postscreen_greet_ttl = 2d
postscreen_greet_wait = 3s
postscreen_non_smtp_command_enable = no
postscreen_pipelining_enable = no
proxy_read_maps = proxy:mysql:/etc/postfix/sql/mysql_virtual_sender_acl.cf, 
proxy:mysql:/etc/postfix/sql/mysql_tls_enforce_out_policy.cf, proxy:mysql:/
etc/postfix/sql/mysql_tls_enforce_in_policy.cf, $local_recipient_maps 
$mydestination $virtual_alias_maps $virtual_alias_domains 
$virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps 
$relay_domains $canonical_maps $sender_canonical_maps 
$recipient_canonical_maps $relocated_maps $transport_maps $mynetworks 
$smtpd_sender_login_maps
queue_run_delay = 300s
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relay_domains = proxy:mysql:/etc/postfix/sql/mysql_virtual_mxdomain_maps.cf
relay_recipient_maps = proxy:mysql:/etc/postfix/sql/
mysql_relay_recipient_maps.cf
relayhost =
sender_dependent_default_transport_maps = proxy:mysql:/etc/postfix/sql/
mysql_tls_enforce_out_policy.cf
smtp_dns_support_level = dnssec
smtp_header_checks = pcre:/etc/postfix/submission_header_cleanup
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_loglevel = 1
smtp_tls_security_level = dane
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname
smtpd_client_restrictions = permit_mynetworks check_client_access hash:/etc/
postfix/without_ptr reject_unknown_client_hostname
smtpd_data_restrictions = reject_unauth_pipelining, permit
smtpd_delay_reject = yes
smtpd_error_sleep_time = 10s
smtpd_hard_error_limit = ${stress?1}${stress:5}
smtpd_helo_required = yes
smtpd_milters = inet:127.0.0.1:12248
smtpd_proxy_timeout = 600s
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, 
reject_invalid_helo_hostname, reject_unknown_reverse_client_hostname, 
reject_unauth_destination
smtpd_restriction_classes = greylist
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_path = private/auth_dovecot
smtpd_sasl_type = dovecot
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/sql/
mysql_virtual_sender_acl.cf
smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch, 
permit_mynetworks, reject_sender_login_mismatch, permit_sasl_authenticated, 
reject_unlisted_sender, reject_unknown_sender_domain
smtpd_soft_error_limit = 3
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/mail/mail.crt
smtpd_tls_ciphers = high
smtpd_tls_dh1024_param_file = /etc/ssl/mail/dhparams.pem
smtpd_tls_eecdh_grade = strong
smtpd_tls_exclude_ciphers = ECDHE-RSA-RC4-SHA, RC4, aNULL
smtpd_tls_key_file = /etc/ssl/mail/mail.key
smtpd_tls_loglevel = 1
smtpd_tls_mandatory_ciphers = high
smtpd_tls_mandatory_exclude_ciphers = ECDHE-RSA-RC4-SHA, RC4, aNULL
smtpd_tls_mandatory_protocols = !SSLv3
smtpd_tls_protocols = !SSLv3
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
tls_high_cipherlist = 
EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:
+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!
MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!ECDSA:CAMELLIA256-SHA:AES256-SHA:CAMELLIA128-
SHA:AES128-SHA
tls_preempt_cipherlist = yes
tls_ssl_options = NO_COMPRESSION
virtual_alias_maps = proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_maps.cf, 
proxy:mysql:/etc/postfix/sql/mysql_virtual_spamalias_maps.cf, proxy:mysql:/
etc/postfix/sql/mysql_virtual_alias_domain_maps.cf, proxy:mysql:/etc/postfix/
sql/mysql_virtual_alias_domain_catchall_maps.cf
virtual_gid_maps = static:5000
virtual_mailbox_base = /var/vmail/
virtual_mailbox_domains = proxy:mysql:/etc/postfix/sql/
mysql_virtual_domains_maps.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/sql/
mysql_virtual_mailbox_maps.cf, proxy:mysql:/etc/postfix/sql/
mysql_virtual_alias_domain_mailbox_maps.cf
virtual_minimum_uid = 104
virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_uid_maps = static:5000