Ostatnio otrzymuje coraz więcej wiadomości e-mail w którejspamer podszywa się pod moja domenę.
Mam regułew smtpd_recipient_restrictions =
check_sender_accesshash:/etc/postfix/sender,
Która sprawdza domeny i nie pozwala na użycie jej w mailfrom bez autoryzacji.
Connected to mail.mojadomana.pl
Escape character is '^]'.
220 mail.mojadomana.pl
helo domena.pl
250 mail.mojadomana.pl
mail from: <tomasz.nowak@mail.mojadomana.pl>
250 2.1.0 Ok
rcpt to: <tomasz.nowak@mail.mojadomana.pl>
554 5.7.1 <tomasz.nowak@mail.mojadomana.pl>: Sender address rejected: Brak uwierzytelnienia poczty wychodzacej - RL
Problem w tym ze spamer w polu mail from podaje swój e-mail albo go niepoddaje ale w header from umieszcza
adres e-mail w mojej domenie i takie coś mój Postfixprzepuszcza.
I rzeczywiście sprawdziłem to i mój Postfix pozwala w headerwpisać from: uzytkownik@mojadomena.pl.
Connected to mail.mojadomana.pl
Escape character is '^]'.
220 mail.mojadomana.pl
helo domena.pl
250 mail.mojadomana.pl
mail from: <0-l76.byovset@awemail.com>
250 2.1.0 Ok
rcpt to: <tomasz.nowak@mail.mojadomana.pl>
data
from: tomasz.nowak@mail.mojadomana.pl
Wysyłając w taki sposób spam klient który odbiera pocztę widzi, że nadawcą jest użytkownik z moją domeną. Czy ktoś spotkał się z takim problem? Poniżej przykładowy spam i moja konfiguracja Postfix’a.
Return-Path: <0-l76.byovset@awemail.com>
X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on
mail.mojadomena.pl
X-Spam-Level:
X-Spam-Status: No, score=-100.0 required=7.0 tests=USER_IN_WHITELIST
autolearn=ham version=3.2.5
X-Original-To:tomasz.nowak@mail.mojadomana.pl
Delivered-To: tomasz.nowak@mail.mojadomana.pl
Received: from localhost (mail.mojadomena.pl [127.0.0.1])
by mail.mojadomena.pl (Postfix) with ESMTP id 5DF855F896
for <tomasz.nowak@mail.mojadomana.pl>; Fri, 2 Sep 2011 16:53:59 +0200 (CEST)
X-Virus-Scanned: amavisd-new at mail.mojadomena.pl
Received: from mail.mojadomena.pl ([127.0.0.1])
by localhost (mail.mojadomena.pl [127.0.0.1]) (amavisd-new, port 10024)
with LMTP id 3aEHTQlOZeex for <tomasz.nowak@mail.mojadomana.pl>;
Fri, 2 Sep 2011 16:53:59 +0200 (CEST)
Received: from client135-147.cmk.ru (client135-147.cmk.ru [195.182.135.147])
by tomasz.nowak@mail.mojadomana.pl (Postfix) with ESMTP id 308F25F872
for <tomasz.nowak@mail.mojadomana.pl>; Fri, 2 Sep 2011 16:52:29 +0200 (CEST)
Received: from 195.182.135.147(helo=mojadomena.pl)
by mail.mojadomena.pl with esmtpa (Exim 4.69)
(envelope-from )
id 1MMP6V-6185ea-9G
for <tomasz.nowak@mail.mojadomana.pl>; Fri, 2 Sep 2011 17:54:23 +0300
From: <tomasz.nowak@mail.mojadomana.pl>
To: <tomasz.nowak@mail.mojadomana.pl>
Subject: Get a New Job Today
Date: Fri, 2 Sep 2011 17:54:23 +0300
MIME-Version: 1.0
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Mailer: jsasl-98
Message-ID: <6831552417.67GD6RO9685888@dviuk.lizrbrmxxa.info>
Are you finding it hard to get your career started?
Our company is established insurance firm who needs a talented candidate to join our operations
and administrative team as a Regional Assistant.
This is a great opportunity for you to develop your skills and to grow within a well, respected company.
The benefits include:
- Basic salary of 3000 Euros plus special bonus system
- 35 days paid off
- Career development
Our company is a world leader in providing insurance support to our partners.
Our experienced HR representatives will listen carefully to your employment needs
and then work diligently to match your skills and qualifications to the duties which will be assigned to you.
Whether you're looking for temporary, temporary-to-permanent or permanent opportunities do not miss
your chance and apply now.
If you are interested, please reply to: Allison@newweb-career.com,Thank you!
Konfiguracja Postfix'a:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
anvil_rate_time_unit = 60s
biff = no
bounce_template_file = /etc/postfix/bounce.cf.pl
broken_sasl_auth_clients = yes
canonical_maps = hash:/etc/postfix/canonical
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = amavisfeed:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
defer_transports =
disable_vrfy_command = yes
header_checks = regexp:/etc/postfix/header_checks
home_mailbox = Maildir/
html_directory = no
inet_interfaces = all
mail_name = Postfix
mail_owner = postfix
mailbox_command = /usr/bin/procmail
mailbox_size_limit = 1024000000
mailbox_transport =
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains =
masquerade_exceptions = root
message_size_limit = 204800000
myhostname = mail.mojadomena.pl
mynetworks = 127.0.0.1
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
relocated_maps = hash:/etc/postfix/relocated
sample_directory = /usr/share/doc/postfix-2.3.3/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_use_tls = yes
smtpd_banner = $myhostname Postfix
smtpd_client_connection_count_limit = 10
smtpd_client_connection_rate_limit = 50
smtpd_client_event_limit_exceptions = $mynetworks
smtpd_client_message_rate_limit = 40
smtpd_client_recipient_rate_limit = 50
smtpd_client_restrictions = permit_sasl_authenticated, reject_rbl_client zen.spamhaus.org, reject_rbl_client cbl.abuseat.org,
smtpd_error_sleep_time = 30
smtpd_hard_error_limit = 5
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_unauth_pipelining, reject_invalid_helo_hostname, permit
smtpd_recipient_limit = 500
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_sender_access hash:/etc/postfix/sender, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rbl_client dul.dnsbl.sorbs.net, reject_rbl_client cbl.abuseat.org, reject_rbl_client dynamic.rbl.tld check_client_access hash:/etc/postfix/whitelist,
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_sender_restrictions = permit_sasl_authenticated, reject_unknown_sender_domain, reject_non_fqdn_sender, reject_unknown_address, reject_sender_login_mismatch, permit
smtpd_soft_error_limit = 3
smtpd_tls_CAfile = /etc/pki/dovecot/certs/posredninew.pem
smtpd_tls_cert_file = /etc/pki/dovecot/certs/publicnew.pem
smtpd_tls_key_file = /etc/pki/dovecot/certs/privatenew.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
strict_rfc821_envelopes = yes
tls_random_source = dev:/dev/urandom
transport_maps = hash:/etc/postfix/transport
unknown_address_reject_code = 550
unknown_hostname_reject_code = 550
unknown_local_recipient_reject_code = 550
virtual_alias_domains = mojadomena.pl
Macie jakieś sposoby aby zabezpieczyć się przed tym typem spamu?
