Hello everyone,

It's very strange, but without changing anything in the configuration of Postfix, we have corrupted SMTP transactions from Thunderbird bĂȘta (Windows) and Outlook (MacOS) but not from command line (Linux) and not from Thunderbird release (Windows).

The transaction looks like this :

|Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: connect from fix.212.21.212.com[212.212.212.212] Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: smtp_stream_setup: maxtime=300 enable_deadline=0 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 127.0.0.0/8 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 127.0.0.0/8 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 10.8.200.0/23 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 10.8.200.0/23 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 79.81.206.215/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 79.81.206.215/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 213.200.217.210/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 213.200.217.210/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 212.147.27.252/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 212.147.27.252/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 212.147.5.60/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 212.147.5.60/32 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: fix.212.21.212.com: no match Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: 212.212.212.212: no match Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: auto_clnt_open: connected to private/anvil Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: send attr request = connect Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: send attr ident = smtps:212.212.212.212 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: private/anvil: wanted attribute: status Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute name: status Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute value: 0 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: private/anvil: wanted attribute: count Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute name: count Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute value: 1 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: private/anvil: wanted attribute: rate Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute name: rate Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute value: 1 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: private/anvil: wanted attribute: (list terminator) Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: input attribute name: (end) Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: > fix.212.21.212.com[212.212.212.212]: 220 mail.ourdomain.com ESMTP Postfix (Debian/GNU) Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_create: SASL service=smtp, realm=(null) Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: name_mask: noanonymous Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: Connecting Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: VERSION?1?1 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: MECH?PLAIN?plaintext Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: name_mask: plaintext Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: MECH?LOGIN?plaintext Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: name_mask: plaintext Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: SPID?29750 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: CUID?141742 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: COOKIE?bd665ec25e0c4b7a964903e36eca89b7 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_connect: auth reply: DONE Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_mech_filter: keep mechanism: PLAIN Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: xsasl_dovecot_server_mech_filter: keep mechanism: LOGIN Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: watchdog_pat: 0x7f07a2af8b70 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: < fix.212.21.212.com[212.212.212.212]: ???? Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ???? ~? CONNECT Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ???? ~? GET Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ???? ~? POST Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: ????: no match Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: > fix.212.21.212.com[212.212.212.212]: 502 5.5.2 Error: command not recognized Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: watchdog_pat: 0x7f07a2af8b70 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: < fix.212.21.212.com[212.212.212.212]: ?????? Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ? ~? CONNECT Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ? ~? GET Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ? ~? POST Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: ?: no match Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: > fix.212.21.212.com[212.212.212.212]: 502 5.5.2 Error: command not recognized Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: watchdog_pat: 0x7f07a2af8b70 Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: < fix.212.21.212.com[212.212.212.212]: ? Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ? ~? CONNECT Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ? ~? GET Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_string: ? ~? POST Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: ?: no match Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: > fix.212.21.212.com[212.212.212.212]: 502 5.5.2 Error: command not recognized Apr 13 16:22:44 mailsvr postfix/smtps/smtpd[17458]: watchdog_pat: 0x7f07a2af8b70 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: smtp_get: timeout Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: > fix.212.21.212.com[212.212.212.212]: 421 4.4.2 mail.ourdomain.com Error: timeout exceeded Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 127.0.0.0/8 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 127.0.0.0/8 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 10.8.200.0/23 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 10.8.200.0/23 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 79.81.206.215/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 79.81.206.215/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 213.200.217.210/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 213.200.217.210/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 212.147.27.252/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 212.147.27.252/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostname: fix.212.21.212.com ~? 212.147.5.60/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_hostaddr: 212.212.212.212 ~? 212.147.5.60/32 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: fix.212.21.212.com: no match Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: match_list_match: 212.212.212.212: no match Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: send attr request = disconnect Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: send attr ident = smtps:212.212.212.212 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: private/anvil: wanted attribute: status Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: input attribute name: status Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: input attribute value: 0 Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: private/anvil: wanted attribute: (list terminator) Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: input attribute name: (end) Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: timeout after UNKNOWN from fix.212.21.212.com[212.212.212.212] Apr 13 16:27:44 mailsvr postfix/smtps/smtpd[17458]: disconnect from fix.212.21.212.com[212.212.212.212] |

It's really extremely strange, I cannot even find what the cause could be ?

If anyone had any suggestion, or at least an idea, it would be great !

Thanks a lot in advance for any help !

Denis


P. S.

|postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 message_size_limit = 22020096 mydestination = mail.ourdomain.ch, ..., localhost.ourdomain.ch, localhost myhostname = mail.ourdomain.ch mynetworks = ... myorigin = /etc/mailname readme_directory = no recipient_bcc_maps = hash:/etc/postfix/bcc_maps recipient_delimiter = + smtp_host_lookup = native smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_client_restrictions = permit_sasl_authenticated, check_client_access cidr:/etc/postfix/access smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_client_access cidr:/etc/postfix/access, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_tls_CAfile = ... smtpd_tls_cert_file = ... smtpd_tls_key_file = ... smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes transport_maps = hash:/etc/postfix/transport virtual_alias_maps = hash:/etc/postfix/virtual virtual_gid_maps = static:1001 virtual_mailbox_base = /var/mail/vhosts virtual_mailbox_domains = [list of domains] virtual_mailbox_limit = 0 virtual_mailbox_maps = hash:/etc/postfix/vmailbox virtual_minimum_uid = 100 virtual_uid_maps = static:1001 |

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