smtp_deley_reject=yes - unused parameter

[Christoph Kukulies]

Durch Zufall sah ich - als ich postfix mehr oder weniger aus Versehen 
von der command line startete 'postfix" - daß es
eine Warnung gab:
/usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: 
smtdp_delay_reject=yes

Ich fand die in keinem log.
main.cf:
#--------------------------------------------------------------------------------------------------------------------------
myhostname = mail.myhost.org
mydomain = myhost.org
myorigin = $mydomain
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

append_dot_mydomain = no

readme_directory = no

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mydestination =  local, localhost.localdomain, localhost

mailbox_size_limit = 51200000
message_size_limit = 51200000
recipient_delimiter =
inet_interfaces = all
inet_protocols = all

##### TLS parameters ######
smtpd_tls_cert_file=/etc/postfix/ssl/mail.myhost.org.crt
smtpd_tls_key_file=/etc/postfix/ssl/mail.myhost.org.key
smtpd_use_tls=yes
smtpd_tls_auth_only=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache


###### SASL Auth ######
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes

smtpd_restriction_classes =
     internal

internal =
     permit_mynetworks,
     permit_sasl_authenticated,
     reject

###### Use Dovecot LMTP Service to deliver Mails to Dovecot ######
##virtual_transport = spamass-dovecot
virtual_transport = lmtp:unix:private/dovecot-lmtp
##### Only allow mail transport if client is authenticated or in own 
network (PHP Scripts, ...) ######
##### allow mail sending if Client is authenticated or in own network 
(PHP scripts, ...) , block spam servers ######
##### smtpd_recipient_restrictions = permit_mynetworks, 
permit_sasl_authenticated, reject_unauth_destination

smtpd_recipient_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    check_client_access hash:/etc/postfix/access,
    check_sender_access hash:/etc/postfix/sender_access,
    reject_unauth_destination,
    reject_rbl_client zen.spamhaus.org,
    reject_rbl_client cbl.abuseat.org,
    reject_rbl_client sbl.spamhaus.org,
    reject_rbl_client dul.dnsbl.sorbs.net,
    permit

#++ CPK 2017-02-21
disable_vrfy_command = yes
smtdp_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
      reject_non_fqdn_hostname,
      reject_invalid_hostname,
      permit
smtpd_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20
###### MySQL Connection ######

virtual_alias_maps = mysql:/etc/postfix/virtual/mysql-aliases.cf
virtual_mailbox_maps = mysql:/etc/postfix/virtual/mysql-maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/virtual/mysql-domains.cf
local_recipient_maps = $virtual_mailbox_maps

content_filter=smtp-amavis:[127.0.0.1]:10024
compatibility_level = 2

smtpd_client_restrictions =
      reject_rbl_client sbl.spamhaus.org,
      check_client_access hash:/etc/postfix/blacklist
smtpd_sender_restrictions = hash:/etc/postfix/access
debug_peer_list = 91.200.0.0/16

#----------------------------------------------------------------------------------------------------------------

Zu welcher Option gehört sie - muß was mit dem initial SMTP-Dialog zu 
tun haben und wann eine Mail abgewiesen wird.
( so eine Art "look ahead" ?)

Grüße
Christoph