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Old 6th May 2013, 15:13
ressel ressel is offline
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Default My server is sending spam

Hello everyone,

I can see my server is being used for sending spam, but I really can't figure out how to close their way into my server, I can se they use multiple ip's to send spam with.

Until now they have only used 1 single customer mail addresse let's just call it webuser@companymail.tld

To prevent them to send more spam I have from ispconfig panel blocked the email in postfix blacklist as sender.

I have tried check for open relay with http://www.mailradar.com/openrelay/ and the result was All tested completed! No relays accepted by remote host!

I have tried disable the customers website and make sure its wasn't mail() by going through /var/log/phpmail.log and result is: spam is not from the website.

I have tried change password on the mail user, but spam was still going into mail queue (the customer don't even know the password atm.).

This is my postfix main.cf have following content:
Code:
# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = /usr/share/doc/postfix

#SPF tjek (http://www.howtoforge.com/hardening-postfix-for-ispconfig-3)
policy-spf_time_limit = 3600s

# TLS parameters
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = myserver.domain.tld
alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
myorigin = /etc/mailname
mydestination = myserver.domain.tld, localhost, localhost.localdomain
relayhost = 
mynetworks = 127.0.0.0/8 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
html_directory = /usr/share/doc/postfix/html
virtual_alias_domains = 
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf, hash:/var/lib/mailman/data/virtual-mailman
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_mailbox_base = /var/vmail
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
#smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination, reject_rbl_client list.dsbl.org, reject_rbl_client sbl.spamhaus.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client dul.dnsbl.sorbs.net,
smtpd_tls_security_level = may
transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf
relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $virtual_mailbox_limit_maps
smtpd_sender_restrictions = check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf
#smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf
smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf
smtpd_client_message_rate_limit = 100
maildrop_destination_concurrency_limit = 1
maildrop_destination_recipient_limit = 1
virtual_transport = maildrop
header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = regexp:/etc/postfix/mime_header_checks
nested_header_checks = regexp:/etc/postfix/nested_header_checks
body_checks = regexp:/etc/postfix/body_checks
owner_request_special = no
content_filter = amavis:[127.0.0.1]:10024
receive_override_options = no_address_mappings


#helo restrictions fra http://www.howtoforge.com/hardening-postfix-for-ispconfig-3
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname, reject_unknown_helo_hostname

#strift rfc fra http://www.howtoforge.com/hardening-postfix-for-ispconfig-3
strict_rfc821_envelopes = yes

#data restrictions fra http://www.howtoforge.com/hardening-postfix-for-ispconfig-3
smtpd_data_restrictions = reject_unauth_pipelining

#smtpd delay
smtpd_delay_reject = yes
message_size_limit = 0
inet_protocols = all

#anti spam fra http://www.cyberciti.biz/tips/postfix-spam-filtering-with-blacklists-howto.html
disable_vrfy_command = yes



#Mailman
virtual_maps = hash:/var/lib/mailman/data/virtual-mailman
owner_request_special = no
inet_protocols = all


authorized_submit_users = !root, static:anyone
this is my master.cf
Code:
#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       -       -       -       smtpd
2525	   inet  n	   -	    -	     -	      -	smtpd

submission inet n       -       -       -       -       smtpd
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
smtps     inet  n       -       -       -       -       smtpd
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628       inet  n       -       -       -       -       qmqpd
pickup    fifo  n       -       -       60      1       pickup
cleanup   unix  n       -       -       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
#qmgr     fifo  n       -       -       300     1       oqmgr
tlsmgr    unix  -       -       -       1000?   1       tlsmgr
rewrite   unix  -       -       -       -       -       trivial-rewrite
bounce    unix  -       -       -       -       0       bounce
defer     unix  -       -       -       -       0       bounce
trace     unix  -       -       -       -       0       bounce
verify    unix  -       -       -       -       1       verify
flush     unix  n       -       -       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       -       -       -       smtp
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay     unix  -       -       -       -       -       smtp
	-o smtp_fallback_relay=
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       -       -       -       showq
error     unix  -       -       -       -       -       error
retry     unix  -       -       -       -       -       error
discard   unix  -       -       -       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       -       -       -       lmtp
anvil     unix  -       -       -       -       1       anvil
scache    unix  -       -       -       -       1       scache
#
# ====================================================================
# 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 vmail ${extension} ${recipient} ${user} ${nexthop} ${sender}
#
# ====================================================================
#
# 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}


amavis unix - - - - 2 smtp
        -o smtp_data_done_timeout=1200
        -o smtp_send_xforward_command=yes

127.0.0.1:10025 inet n - - - - smtpd
        -o content_filter=
        -o local_recipient_maps=
        -o relay_recipient_maps=
        -o smtpd_restriction_classes=
        -o smtpd_client_restrictions=
        -o smtpd_helo_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o mynetworks=127.0.0.0/8
        -o strict_rfc821_envelopes=yes
        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
        -o smtpd_bind_address=127.0.0.1


policy-spf  unix  -       n       n       -       -       spawn
     user=nobody argv=/usr/bin/policyd-spf
after i have blocked the mail user in ispconfig I still see following in syslog
Code:
May  6 13:53:19 web2 postfix/smtpd[25077]: connect from unknown[***.***.128.138]
May  6 13:53:21 web2 postfix/smtpd[25319]: warning: ***.210.111.33: address not listed for hostname 81-210-111-33.ip.netia.com.pl
May  6 13:53:21 web2 postfix/smtpd[25319]: connect from unknown[***.210.111.33]
May  6 13:53:21 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<dpower@jhancock.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:21 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<wghrhzxi@jhbdjlvg.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:21 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<aunnfg@jhkmjh.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:21 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<ghpvbyif@jhxvvjas.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:21 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<rjjtgody@jkbgeqhb.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:21 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<vtkhdb@jkmyqu.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:22 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<josh@jlscustoms.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:22 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<ckmombyu@jnmhhyso.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:22 web2 postfix/smtpd[25077]: NOQUEUE: reject: RCPT from unknown[***.***..128.138]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<kwmnix@jnmtcf.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:22 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<k1aj@netzero.net> proto=ESMTP helo=<companymail.tld>
May  6 13:53:22 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<alshack@netzero.net> proto=ESMTP helo=<companymail.tld>
May  6 13:53:22 web2 postfix/smtpd[25326]: connect from tx2outboundsmtppool1.messaging.microsoft.com[***.55.83.131]
May  6 13:53:22 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<md052794@netzero.net> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<angieb12@netzero.net> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<xavierfernand.santos@neuf.fr> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25268]: lost connection after DATA from unknown[***.71.125.14]
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<salifou.savadogo@neuf.fr> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<dsin80@neuf.fr> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<contacto@neverland.com.ar> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<danny@newdisease.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<rmoore@newpi.com> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25319]: NOQUEUE: reject: RCPT from unknown[***.210.111.33]: 554 5.7.1 <webuser@companymail.tld>: Sender address rejected: Access denied; from=<webuser@companymail.tld> to=<legal@newstarsa.com.ar> proto=ESMTP helo=<companymail.tld>
May  6 13:53:23 web2 postfix/smtpd[25326]: NOQUEUE: reject: RCPT from tx2outboundsmtppool1.messaging.microsoft.com[***.55.83.131]: 450 4.7.1 <TX2EHSNDR002.bigfish.com>: Helo command rejected: Host not found; from=<> to=<webuser@companymail.tld> proto=ESMTP helo=<TX2EHSNDR002.bigfish.com>
May  6 13:53:24 web2 postfix/smtpd[25326]: disconnect from tx2outboundsmtppool1.messaging.microsoft.com[***.55.83.131]
If you need more info or logs please tell me.
How can I prevent these spammers from sending mails through my server?
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