Ich habe es auch schon mit abgeschaltetem IPtables probier, mit dem selben Ergebnis.
Das dumme daran ist, dass mein letztes Update am 25.8. war, wo ist Debian auf den neuesten Stand gebracht habe. Danach sind noch über 100 Mails versendet worden. Das Problem trat am 2.9. erstmalig auf. Und in Zwischenzeit wurde nichts am Server modifiziert. Keine Konfig angefasst, neue Dienste dazu geschaltet oder Zertifikate erneuert. Einfach nichts.
Eben habe ich mir die Logfiles nochmal angeschaut und den Loglevel für smtp hochgeschraubt. Dann konnte ich erkennen, das Mail an gmail.com Konten über IPv6 transportiert werden und es dort keine Problem gibt.
Ich kann gerne mal die Postconf hier posten, vielleicht läuft bei mir doch etwas schief, was sich plötzlich bemerkbar macht.
Netcat habe ich auch direkt ausporobiert
Code: Alles auswählen
netcat -zv -w 3 mx01.emig.gmx.net 25
mx01.emig.gmx.net [212.227.17.5] 25 (smtp) open
netcat -zv -w 3 mx01.emig.gmx.net 465
mx01.emig.gmx.net [212.227.17.5] 465 (submissions) : Connection refused
netoldie@mx01:~$ netcat -zv -w 3 mx01.emig.gmx.net 587
mx01.emig.gmx.net [212.227.17.5] 587 (submission) : Connection refused
Daraus schließe ich doch das Port 25 offen ist und der Austausch stattfinden müsste.
Selbst bei meinem Provider (contabo) werden die Mails nicht zugestellt. Ich bin momentan völlig ratlos und überlege wo ich eine default config herbekomme, die dann mal ausprobiere.
Übrigens: Danke für dein große Mühe mir zu helfen!
Code: Alles auswählen
alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
append_dot_mydomain = no
biff = no
body_checks = regexp:/etc/postfix/body_checks
broken_sasl_auth_clients = yes
compatibility_level = 3.6
dovecot_destination_recipient_limit = 1
greylisting = check_policy_service inet:localhost:10023
header_checks = regexp:/etc/postfix/header_checks
html_directory = /usr/share/doc/postfix/html
inet_interfaces = all
inet_protocols = all
mailbox_size_limit = 0
maildrop_destination_concurrency_limit = 1
maildrop_destination_recipient_limit = 1
message_size_limit = 0
milter_default_action = accept
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_protocol = 6
mime_header_checks = regexp:/etc/postfix/mime_header_checks
mydestination = $myhostname, localhost.xxx.de, proliant.xxx.local, localhost
myhostname = mx01.24netz.de
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 5.45.xxx.88/32 [2a03:4000:6:1466::]
myorigin = /etc/mailname
nested_header_checks = regexp:/etc/postfix/nested_header_checks
non_smtpd_milters = inet:localhost:11332
owner_request_special = no
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailb
ox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynet
works $smtpd_sender_login_maps
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf
relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
relayhost =
sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf
smtp_tls_CApath = /etc/ssl/certs
smtp_tls_cert_file = /etc/postfix/postfix.pem
smtp_tls_exclude_ciphers = RC4, aNULL
smtp_tls_key_file = /etc/postfix/postfix.key
smtp_tls_loglevel = 2
smtp_tls_note_starttls_offer = yes
smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtp_tls_security_level = encrypt
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_client_message_rate_limit = 100
smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, check_helo_access regexp:/etc/postfix/helo_access, reject_invalid_hostname, reject_non_fqdn_hostname, reject_invalid_helo_hostname, reject_unknown_helo_hostname, check_helo_access regexp:/etc/postfix/blacklist_helo
smtpd_milters = inet:localhost:11332
mtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_restriction_classes = greylisting
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf
smtpd_sender_restrictions = check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf, permit_mynetworks, permit_sasl_authenticated
smtpd_tls_CApath = /etc/ssl/certs
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/postfix/postfix.pem
smtpd_tls_dh1024_param_file = /etc/ssl/dhparam_4096.pem
smtpd_tls_exclude_ciphers = RC4, aNULL
smtpd_tls_key_file = /etc/postfix/postfix.key
smtpd_tls_loglevel = 2
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
tls_medium_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
tls_preempt_cipherlist = yes
tls_ssl_options = NO_RENEGOTIATION
transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
virtual_alias_domains =
virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf
virtual_gid_maps = mysql:/etc/postfix/mysql-virtual_gids.cf
virtual_mailbox_base = /var/vmail
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_uid_maps = mysql:/etc/postfix/mysql-virtual_uids.cf