Oct 18 09:09:47 mail postfix/smtpd[81785]: > mail-pg1-f169.google.com[209.85.215.169]: 250 2.0.0 Ok: 2342 bytes queued as 4C44B3CB22D
Oct 18 09:09:47 mail postfix/local[81795]: 4C44B3CB22D: to=<rene@example.com>, relay=local, delay=0.05, delays=0.04/0/0/0.01, dsn=5.2.0, status=bounced (cannot append message to file /usr/local/libexec/dovecot/dovecot-lda: cannot create file exclusively: Permission denied)

root@parakeet:/usr/local/libexec# ls -al /
drwxr-xr-x  13 root root       4096 okt 12 12:48 usr

root@parakeet:/usr/local/libexec# ls -al /usr
drwxr-xr-x  12 root root 12288 sep 18 09:38 libexec

root@parakeet:/usr/local/libexec# ls -al /usr/local
drwxr-xr-x  3 mail mail 4096 okt 18 05:51 libexec

root@parakeet:/usr/local/libexec# ls -al /usr/local/libexec/
drwxr-xr-x  2 mail mail 4096 okt 18 05:51 dovecot

root@parakeet:/usr/local/libexec# ls -al /usr/local/libexec/dovecot/
total 8
drwxr-xr-x 2 mail mail 4096 okt 18 05:51 .
drwxr-xr-x 3 mail mail 4096 okt 18 05:51 ..

root@parakeet:/etc/postfix# cat main.cf
maillog_file = /var/log/postfix.log
smtpd_banner = $myhostname ESMTP $mail_name
biff = no
append_dot_mydomain = no
readme_directory = no

# TLS parameters
smtp_use_tls = yes
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_cert_file = /etc/letsencrypt/live/mail.example.com/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mail.example.com/privkey.pem
smtpd_tls_loglevel = 1
#smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated,  reject_unauth_destination

smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

smtpd_helo_restrictions =
    permit_sasl_authenticated
    permit_mynetworks
    reject_unauth_destination
    reject_non_fqdn_sender
    reject_non_fqdn_recipient
    reject_unknown_recipient_domain
    reject_non_fqdn_hostname
    reject_invalid_hostname
    reject_rbl_client zen.spamhaus.org
    reject_unauth_pipelining
    permit
smtpd_recipient_restrictions =
    permit_sasl_authenticated
    permit_mynetworks
    reject_invalid_hostname
    reject_non_fqdn_hostname
    reject_non_fqdn_recipient
    reject_non_fqdn_sender
    reject_unknown_sender_domain
    reject_unknown_recipient_domain
    reject_sender_login_mismatch
    reject_unauth_pipelining
    reject_unauth_destination
    reject_multi_recipient_bounce
    reject_non_fqdn_helo_hostname
    reject_invalid_helo_hostname
    reject_rbl_client zen.spamhaus.org
    permit
smtpd_sender_restrictions =
    permit_sasl_authenticated
    permit_mynetworks
    reject_unauth_destination
    reject_non_fqdn_sender
    reject_non_fqdn_recipient
    reject_unknown_recipient_domain
    reject_unauth_pipelining
    reject_rbl_client zen.spamhaus.org
    permit
smtpd_client_restrictions = reject_invalid_hostname
smtpd_data_restrictions =
    reject_unauth_pipelining
    reject_multi_recipient_bounce
    permit
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_exceptions_networks = $mynetworks
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

smtp_tls_security_level = may

virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_mailbox_domains = /etc/postfix/virtual_mailbox_domains

myhostname = mail.example.com
myorigin = /etc/mailname
mydestination = nicer.app, localhost.$mydomain, localhost
mynetworks = 192.168.178.0/24 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
mailbox_command = /etc/postfix/dovecot-lda-relay -f "$SENDER" -a "$RECIPIENT"
recipient_delimiter = +
inet_interfaces = all
#inet_protocols = all
inet_protocols = ipv4
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases

debug_peer_level = 10
debug_peer_list = nicer.app, 192.168.178.0/24

root@parakeet:/etc/postfix# cat master.cf
#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master" or
# on-line: http://www.postfix.org/master.5.html).
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
smtp      inet  n       -       y       -       -       smtpd -v
#smtp      inet  n       -       y       -       1       postscreen
#smtpd     pass  -       -       y       -       -       smtpd
#dnsblog   unix  -       -       y       -       0       dnsblog
#tlsproxy  unix  -       -       y       -       0       tlsproxy
submission inet n       -       y       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_tls_auth_only=yes
  -o smtpd_reject_unlisted_recipient=no
  -o smtpd_client_restrictions=$mua_client_restrictions
  -o smtpd_helo_restrictions=$mua_helo_restrictions
  -o smtpd_sender_restrictions=$mua_sender_restrictions
  -o smtpd_recipient_restrictions=
  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
  -o milter_macro_daemon_name=ORIGINATING
smtps     inet  n       -       y       -       -       smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_reject_unlisted_recipient=no
  -o smtpd_client_restrictions=$mua_client_restrictions
  -o smtpd_helo_restrictions=$mua_helo_restrictions
  -o smtpd_sender_restrictions=$mua_sender_restrictions
  -o smtpd_recipient_restrictions=
  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
  -o milter_macro_daemon_name=ORIGINATING
dovecot unix    -       n       n       -       -      pipe
  flags=DRhu user=vmail:vmail argv=/etc/postfix/dovecot-lda-relay -f ${sender} -d ${user}@${nexthop} -m ${extension}
#628       inet  n       -       y       -       -       qmqpd
pickup    unix  n       -       y       60      1       pickup
cleanup   unix  n       -       y       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
#qmgr     unix  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       y       1000?   1       tlsmgr
rewrite   unix  -       -       y       -       -       trivial-rewrite
bounce    unix  -       -       y       -       0       bounce
defer     unix  -       -       y       -       0       bounce
trace     unix  -       -       y       -       0       bounce
verify    unix  -       -       y       -       1       verify
flush     unix  n       -       y       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       y       -       -       smtp
relay     unix  -       -       y       -       -       smtp
        -o syslog_name=postfix/$service_name
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       y       -       -       showq
error     unix  -       -       y       -       -       error
retry     unix  -       -       y       -       -       error
discard   unix  -       -       y       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       y       -       -       lmtp
anvil     unix  -       -       y       -       1       anvil
scache    unix  -       -       y       -       1       scache
postlog   unix-dgram n  -       n       -       1       postlogd
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus     unix  -       n       n       -       -       pipe
#  user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix  -       n       n       -       2       pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}