leider musste ich feststellen, dass nach einer Neuinstallation unseres Systems die e-Mails von dem Mailserver als Spam gekennzeichnet werden.
Aktuell weiß ich, dass das bei Outlook und Googlemail ist.
Ich kenne mich zwar recht gut mit Linux Konfiguration und Verwaltung aus aber mit Mailserver habe ich mich nie richtig verstanden. Wenn sie laufen, dann laufen Sie

Ich habe Debian 7.9.0 ohne Grafischer-Oberfläche auf meinem Server laufen. Der Mailserver läuft über dovecot und wird mit postfixadmin Konfiguriert. Das SSL-Zertifikat wurde mit openssl erstellt. Auf http://mxtoolbox.com/SuperTool.aspx habe ich die Domain bereits nach Spam Einträgen geprüft.
Hier einmal die Nachrichtenquelle, welche in Outlook angezeigt wird. Die Nachricht wurde von Postfix über das Web-Interface gesendet. Mit einer Mail-Client-Software landen die e-Mails auch im Spam.
Code: Alles auswählen
Received: from DB3PR06MB121.eurprd06.prod.outlook.com (10.141.1.13) by
AMSPR06MB117.eurprd06.prod.outlook.com (10.242.90.139) with Microsoft SMTP
Server (TLS) id 15.1.485.3 via Mailbox Transport; Fri, 6 May 2016 13:45:48
+0000
Received: from DB4PR06CA0059.eurprd06.prod.outlook.com (10.162.49.27) by
DB3PR06MB121.eurprd06.prod.outlook.com (10.141.1.13) with Microsoft SMTP
Server (TLS) id 15.1.485.3; Fri, 6 May 2016 13:45:48 +0000
Received: from HE1EUR01FT009.eop-EUR01.prod.protection.outlook.com
(2a01:111:f400:7e1f::207) by DB4PR06CA0059.outlook.office365.com
(2a01:111:e400:9866::27) with Microsoft SMTP Server (TLS) id 15.1.492.4 via
Frontend Transport; Fri, 6 May 2016 13:45:48 +0000
Received: from SNT004-MC1F22.hotmail.com (10.152.0.51) by
HE1EUR01FT009.mail.protection.outlook.com (10.152.0.77) with Microsoft SMTP
Server (TLS) id 15.1.485.4 via Frontend Transport; Fri, 6 May 2016 13:45:46
+0000
Received: from domain.de ([xxx.xxx.xx.xx]) by SNT004-MC1F22.hotmail.com with Microsoft SMTPSVC(7.5.7601.23143);
Fri, 6 May 2016 06:45:45 -0700
Received: from rv1738 (localhost [IPv6:::1])
by domain.de (Postfix) with ESMTP id 9A20C140C7B
for <empfänger@outlook.de>; Fri, 6 May 2016 15:45:42 +0200 (CEST)
To: <empfänger@outlook.de>
From: <admin@domain.de>
Subject: Willkommen
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Message-ID: <20160506134542.9A20C140C7B@domain.de>
Date: Fri, 6 May 2016 15:45:42 +0200
Return-Path: admin@domain.de
X-OriginalArrivalTime: 06 May 2016 13:45:45.0398 (UTC) FILETIME=[96E88560:01D1A79D]
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CMM-sending-ip: xxx.xxx.xx.xx
CMM-Authentication-Results: hotmail.com; spf=none (sender IP is
xxx.xxx.xx.xx) smtp.mailfrom=admin@domain.de; dkim=none
header.d=domain.de; x-hmca=none header.id=admin@domain.de
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CMM-X-AUTH-Result: NONE
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Code: Alles auswählen
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# TLS parameters
smtpd_tls_cert_file=/etc/postfix/ssl/mailserver.crt
smtpd_tls_key_file=/etc/postfix/ssl/mailserver.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_tls_security_level = may
# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
myhostname = domain.de
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = domain.de, SERVERNUMBER.SERVERNUMBER.1blu.de, localhost.SERVERNUMBER.1blu.de, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
# a bit more spam protection
disable_vrfy_command = yes
# Auth
smtpd_sasl_type=dovecot
smtpd_sasl_path=private/auth_dovecot
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
broken_sasl_auth_clients = yes
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_reci$
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-sender-login-maps.cf
smtpd_sender_restrictions = reject_authenticated_sender_login_mismatch
reject_unknown_sender_domain
smtpd_recipient_restrictions = permit_sasl_authenticated
permit_mynetworks
reject_unauth_destination
# Virtual mailboxes
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual-alias-maps.cf
virtual_mailbox_base = /var/vmail/
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual-domains-maps.cf
virtual_mailbox_limit = 0
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_minimum_uid = 104
virtual_transport = dovecot
local_transport = virtual
virtual_uid_maps = static:6000
virtual_gid_maps = static:6000
dovecot_destination_recipient_limit = 1
Ich bedanke mich schon einmal im Voraus. Vielen lieben Dank!

Grüße,
Sebastian