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inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, und alle meine Domainnamen in kommaseparierter Liste

#spam-schutz ?
disable_vrfy_command = yes
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
 reject_non_fqdn_hostname,
 reject_invalid_hostname,
 permit
smtpd_recipient_restrictions =
 reject_invalid_hostname,
 reject_non_fqdn_sender,
 reject_non_fqdn_recipient,
 reject_unknown_sender_domain,
 reject_unknown_recipient_domain,
 permit_sasl_authenticated,
 permit_mynetworks,
 reject_unauth_destination,
 reject_unknown_reverse_client_hostname,
 reject_rbl_client list.dsbl.org,
 reject_rbl_client sbl.spamhaus.org,
 reject_rbl_client cbl.abuseat.org,
 reject_rbl_client dul.dnsbl.sorbs.net,
 permit
 #reject_non_fqdn_hostname,
smtpd_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20
#ggf. vorhandene Einstellungen auskommentieren   

 service pop3s
{
socket_type = stream
protocol = tcp
wait = no
user = root
server = /usr/sbin/popper
server_args = -f /etc/qpopper-tls.conf
}

openssl req -new -x509 -nodes -out servername.pem -keyout servername.pem -days 3650

set tls-support = alternate-port
set tls-version = default
set tls-server-cert-file = /etc/postfix/servername.pem