Hier das Log:

Dec 27 10:12:07 mail postfix/smtpd[17239]: warning: 217.114.212.50: hostname ns.km22634.keymachine.de verification failed: Name or service not known
Dec 27 10:12:07 mail postfix/smtpd[17239]: connect from unknown[217.114.212.50]
Dec 27 10:12:07 mail postfix/smtpd[17239]: setting up TLS connection from unknown[217.114.212.50]
Dec 27 10:12:07 mail postfix/smtpd[17239]: Anonymous TLS connection established from unknown[217.114.212.50]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Dec 27 10:12:07 mail postfix/smtpd[17239]: NOQUEUE: reject: RCPT from unknown[217.114.212.50]: 450 4.7.1 Client host rejected: cannot find your hostname, [217.114.212.50]; from=<admin@kunden_domain.de> to=<info@meine_domain.com> proto=ESMTP helo=<km22634.keymachine.de>
Dec 27 10:12:07 mail postfix/smtpd[17239]: disconnect from unknown[217.114.212.50]

hier die andere:

Dec 24 20:12:01 mail postfix/smtpd[31127]: warning: 62.146.124.175: address not listed for hostname de-post.webgains.com
Dec 24 20:12:01 mail postfix/smtpd[31127]: connect from unknown[62.146.124.175]
Dec 24 20:12:01 mail postfix/smtpd[31127]: NOQUEUE: reject: RCPT from unknown[62.146.124.175]: 450 4.7.1 Client host rejected: cannot find your hostname, [62.146.124.175]; from=<bounce+info=meine_domain.com@webgains.com> to=<info@meine_domain.com> proto=ESMTP helo=<de-post.webgains.com>
Dec 24 20:12:01 mail postfix/smtpd[31127]: disconnect from unknown[62.146.124.175]

62.146.124.127 OK

62.146.124.175 OK

ns.km22634.keymachine.de OK

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_client_access hash:/etc/postfix/whitelist, reject_unauth_destination, reject_unauth_pipelining, reject_non_fqdn_recipient, reject_invalid_hostname, check_policy_service inet:127.0.0.1:60000, permit

eingefügt, aber leider ohne Erfolg. Hat wer einen Tip für mich ?

mail:/etc/postfix# postconf -n

alias_database = hash:/etc/aliases

alias_maps = $alias_database

append_dot_mydomain = yes

biff = yes

broken_sasl_auth_clients = yes

command_directory = /usr/sbin

config_directory = /etc/postfix

daemon_directory = /usr/lib/postfix

default_destination_concurrency_limit = 50

default_destination_recipient_limit = 1

home_mailbox = Maildir/

inet_interfaces = all

local_destination_concurrency_limit = 1

local_transport = dovecot

mail_spool_directory = /var/vmail

mailbox_delivery_lock = fcntl

mailbox_size_limit = 0

message_size_limit = 0

milter_connect_macros = i b j _ {daemon_name} {if_name} {if_addr}

milter_default_action = accept

milter_protocol = 6

mydestination = localhost.localdomain, localhost

myhostname = mail.meine_domain.com

mynetworks = 127.0.0.0/8

notify_classes = resource, software, protocol, policy, delay, 2bounce, bounce

proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_domains $mynetworks

receive_override_options = no_address_mappings

sendmail_path = /usr/sbin/sendmail

smtp_tls_note_starttls_offer = yes

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)

smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_client

smtpd_helo_required = yes

smtpd_milters = unix:/var/run/clamav/clamav-milter.ctl

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unauth_pipelining, reject_non_fqdn_recipient, reject_invalid_hostname, check_policy_service inet:127.0.0.1:60000, permit

smtpd_sasl_auth_enable = yes

smtpd_sasl_authenticated_header = yes

smtpd_sasl_local_domain = $myhostname

smtpd_sasl_path = private/auth

smtpd_sasl_security_options = noanonymous

smtpd_sasl_type = dovecot

smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_hostname, reject_unknown_recipient_domain, reject_unknown_sender_domain

smtpd_tls_auth_only = no

smtpd_tls_cert_file = /etc/postfix/smtpd.cert

smtpd_tls_key_file = /etc/postfix/smtpd.key

smtpd_tls_loglevel = 1

smtpd_tls_received_header = yes

smtpd_tls_session_cache_timeout = 3600s

smtpd_use_tls = yes

tls_random_source = dev:/dev/urandom

virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf,mysql:/etc/postfix/mysql-email2email.cf

virtual_gid_maps = static:5000

virtual_mailbox_base = /var/vmail

virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf

virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf

virtual_transport = dovecot

virtual_uid_maps = static:5000

mail:/etc/postfix#