status=deferred (delivery temporarily suspended: lost connection with ------[private/dovecot-lmtp] while sending end of data

[Andreas]

Hallo zusammen,

ich habe folgende Konfiguration mit Postfix/Dovecot/Rspamd auf einem aktuellen 
Debian 12 Linux:

postconf -nf
append_dot_mydomain = no
biff = no
bounce_queue_lifetime = 1h
compatibility_level = 3.6
confirm_delay_cleared = yes
delay_warning_time = 60
disable_vrfy_command = yes
html_directory = /usr/share/doc/postfix/html
inet_interfaces = all
local_recipient_maps = $virtual_mailbox_maps
mailbox_size_limit = 0
maximal_backoff_time = 15m
maximal_queue_lifetime = 1h
message_size_limit = 52428800
milter_default_action = tempfail
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_protocol = 6
minimal_backoff_time = 5m
mua_client_restrictions = permit_mynetworks permit_sasl_authenticated reject
mua_relay_restrictions = reject_non_fqdn_recipient
    reject_unknown_recipient_domain permit_mynetworks 
permit_sasl_authenticated
    reject
mua_sender_restrictions = permit_mynetworks reject_non_fqdn_sender
    reject_sender_login_mismatch permit_sasl_authenticated reject
mydestination = mx1.germany.com, localhost.germany.com, localhost
myhostname = mx1.germany.com
mynetworks = 127.0.0.0/8 192.168.1.0/24 192.109.24.0/24 [::ffff:127.0.0.0]/104
    [::1]/128
myorigin = /etc/mailname
non_smtpd_milters = inet:localhost:11332
plaintext_reject_code = 550
postscreen_access_list = permit_mynetworks cidr:/etc/postfix/postscreen_access
postscreen_bare_newline_enable = no
postscreen_blacklist_action = drop
postscreen_cache_cleanup_interval = 24h
postscreen_cache_map = proxy:btree:$data_directory/postscreen_cache
postscreen_dnsbl_action = enforce
postscreen_dnsbl_sites = b.barracudacentral.org=127.0.0.2*7
    dnsbl.inps.de=127.0.0.2*7 bl.mailspike.net=127.0.0.2*5
    bl.mailspike.net=127.0.0.[10;11;12]*4 dnsbl.sorbs.net=127.0.0.10*8
    dnsbl.sorbs.net=127.0.0.5*6 dnsbl.sorbs.net=127.0.0.7*3
    dnsbl.sorbs.net=127.0.0.8*2 dnsbl.sorbs.net=127.0.0.6*2
    dnsbl.sorbs.net=127.0.0.9*2 zen.spamhaus.org=127.0.0.[4..7]*6
    zen.spamhaus.org=127.0.0.3*4 zen.spamhaus.org=127.0.0.2*3
    hostkarma.junkemailfilter.com=127.0.0.2*3
    hostkarma.junkemailfilter.com=127.0.0.4*1
    hostkarma.junkemailfilter.com=127.0.1.2*1
    wl.mailspike.net=127.0.0.[18;19;20]*-2
    hostkarma.junkemailfilter.com=127.0.0.1*-2
postscreen_dnsbl_threshold = 8
postscreen_dnsbl_ttl = 5m
postscreen_greet_action = enforce
postscreen_greet_banner = $smtpd_banner
postscreen_greet_ttl = 2d
postscreen_greet_wait = 3s
postscreen_non_smtp_command_enable = no
postscreen_pipelining_enable = no
proxy_read_maps = proxy:mysql:/etc/postfix/sql/mysql_virtual_sender_acl.cf,
    proxy:mysql:/etc/postfix/sql/mysql_tls_enforce_out_policy.cf,
    proxy:mysql:/etc/postfix/sql/mysql_tls_enforce_in_policy.cf,
    proxy:mysql:/etc/postfix/sql/sender-login-maps.cf, $local_recipient_maps
    $mydestination $virtual_alias_maps $virtual_alias_domains
    $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps
    $relay_domains $mynetworks $smtpd_sender_login_maps
queue_run_delay = 5m
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relay_domains = proxy:mysql:/etc/postfix/sql/mysql_virtual_mxdomain_maps.cf
relay_recipient_maps =
    proxy:mysql:/etc/postfix/sql/mysql_relay_recipient_maps.cf
smtp_dns_support_level = dnssec
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_ciphers = medium
smtp_tls_loglevel = 1
smtp_tls_policy_maps = mysql:/etc/postfix/sql/tls-policy.cf
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_security_level = dane
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname
smtpd_client_restrictions = permit_mynetworks check_client_access
    hash:/etc/postfix/without_ptr reject_unknown_client_hostname
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_error_sleep_time = 10s
smtpd_hard_error_limit = ${stress?1}${stress:5}
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks reject_invalid_helo_hostname
    reject_non_fqdn_helo_hostname reject_unknown_helo_hostname
smtpd_milters = inet:localhost:11332
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks,
    reject_invalid_helo_hostname, reject_unknown_reverse_client_hostname,
    reject_unauth_destination
smtpd_relay_restrictions = reject_non_fqdn_recipient
    reject_unknown_recipient_domain permit_mynetworks 
reject_unauth_destination
smtpd_sender_login_maps =
    proxy:mysql:/etc/postfix/sql/mysql_virtual_sender_acl.cf
smtpd_soft_error_limit = 3
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/letsencrypt/live/mx1.germany.com/fullchain.pem
smtpd_tls_ciphers = medium
smtpd_tls_dh1024_param_file = /etc/ssl/mail/dhparams_2048.pem
smtpd_tls_dh512_param_file = /etc/ssl/mail/dhparams_512.pem
smtpd_tls_exclude_ciphers = ECDHE-RSA-RC4-SHA, RC4, aNULL
smtpd_tls_key_file = /etc/letsencrypt/live/mx1.germany.com/privkey.pem
smtpd_tls_loglevel = 1
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_exclude_ciphers = ECDHE-RSA-RC4-SHA, RC4, aNULL
smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtpd_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
tls_medium_cipherlist = EECDH+AESGCM:EDH+AESGCM
tls_preempt_cipherlist = yes
tls_ssl_options = NO_COMPRESSION
virtual_alias_maps = proxy:mysql:/etc/postfix/sql/mysql_virtual_alias_maps.cf,
    proxy:mysql:/etc/postfix/sql/mysql_virtual_spamalias_maps.cf
virtual_gid_maps = static:5000
virtual_mailbox_domains =
    proxy:mysql:/etc/postfix/sql/mysql_virtual_domains_maps.cf
virtual_mailbox_maps =
    proxy:mysql:/etc/postfix/sql/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 104
virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_uid_maps = static:5000

Leider werden die eingehenden Mails in die Warteschleife gelegt:
2024-03-02T19:09:52.369866+01:00 mx1 postfix/error[2331]: 8B6BB420852: 
to=<systemmails at germany.com>, relay=none, delay=0.81, delays=0.78/0.01/0/0.02, 
dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection 
with mx1.germany.com[private/dovecot-lmtp] while sending end of data -- 
message may be sent more than once)

In der Postqeue stapeln sich unzugestellte Mails.

In der /etc/dovecot.conf habe ich beim "service lmtp”
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
  user = vmail
  vsz_limit = 1024 M
}
vsz_limit = 1024 M hinzugefügt und den dovecot.service reloaded.

Leider ohne Erfolg.

doveconf | grep vsz_limit
default_vsz_limit = 256 M
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 1 G
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 1 G
  vsz_limit = 18446744073709551615 B
  vsz_limit = 128 M
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B
  vsz_limit = 18446744073709551615 B

Hier ist zu sehen, dass default_vsz_limit noch bei 256 MB liegt.
Kennt Ihr dieses Phänomen?

Grüße
Andreas