Hallo Florian,
bitte poste noch alle Deine lokalen Änderungen an der postfix Konfiguration, die Du mit dem Kommando "postconf -n" angezeigt bekommst.
root@mailserver:# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix content_filter = smtp-amavis:[127.0.0.1]:10024 inet_interfaces = all mailbox_size_limit = 0 mydestination = mailserver, localhost, mailserver.example.org, localhost.example.org myhostname = mailserver.example.org mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no receive_override_options = no_address_mappings recipient_delimiter = + relay_domains = relayhost = [smtp.hispeed.ch] smtp_sasl_auth_enable = yes smtp_sasl_mechanism_filter = plain, login smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd_hispeed_smtp smtp_sasl_security_options = noanonymous smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes soft_bounce = yes virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf 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
Gruss, Reto