#1  
Old 9th December 2013, 10:33
chrees chrees is offline
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Default Postfix and relay problem

Hello!
I have installed postfix 2.3.6. on my server. For some time I have a problem with spam: the server is used to send spam by unauthorized users. Most spam is sent from an address localhost.mydomain.tld where mydomain.tld course is swapped for my domain. Server URL is a myserver.mydomain.tld. Practically, I do not see spam sent from this address. For this reason, a lot of public servers reject emails from my server.
How can I solve this problem?
Best regards*
chrees

ps. I attach the configuration of postfix (main.cf)
Code:
queue_directory = /var/spool/postfix

command_directory = /usr/sbin

daemon_directory = /usr/lib/postfix

mail_owner = postfix

myhostname = myserver.mydomain.tld

mydomain = mydomain.tld

myorigin = $myhostname

inet_interfaces = all

mydestination = $myhostname

unknown_local_recipient_reject_code = 550

mynetworks =  127.0.0.0/8

:relay_domains = $mydestination

home_mailbox = .maildir/

smtpd_banner = $myhostname System

local_destination_concurrency_limit = 2
default_destination_concurrency_limit = 20

debug_peer_level = 2

debugger_command =
	 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
	 xxgdb $daemon_directory/$process_name $process_id & sleep 5

sendmail_path = /usr/sbin/sendmail

newaliases_path = /usr/bin/newaliases

mailq_path = /usr/bin/mailq

setgid_group = postdrop

html_directory = /usr/share/doc/postfix-2.3.6/html

manpage_directory = /usr/share/man

sample_directory = /etc/postfix

home_mailbox = .maildir/

smtpd_sasl_auth_enable = yes
smtpd_sasl2_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_local_domain =

smtpd_recipient_restrictions =
  permit_sasl_authenticated,
  permit_mynetworks,

  reject_unauth_destination

smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_use_tls = yes

smtpd_tls_key_file = /etc/ssl/postfix/key.pem
smtpd_tls_cert_file = /etc/ssl/postfix/cert.pem
smtpd_tls_CAfile = /etc/ssl/postfix/ca.pem

smtpd_tls_loglevel = 3
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

message_size_limit = 150000000
mailbox_size_limit = 200000000
virtual_mailbox_limit = 200000000

local_transport = local
local_recipient_maps = $alias_maps $virtual_mailbox_maps unix:passwd.byname

virtual_alias_maps = mysql:/etc/postfix/mysql/mysql_virtual_alias_maps.cf
virtual_alias_domains = $virtual_alias_maps

virtual_uid_maps = static:1000
virtual_gid_maps = static:1000
virtual_minimum_uid = 1000

virtual_mailbox_base = /
virtual_mailbox_domains = mysql:/etc/postfix/mysql/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql/mysql_virtual_mailbox_maps.cf
transport_maps = mysql:/etc/postfix/mysql/mysql_transport.cf

biff = no
empty_address_recipient = MAILER-DAEMON 
queue_minfree = 120000000
      
maximal_queue_lifetime = 6h
delay_warning_time = 0h
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  #2  
Old 9th December 2013, 22:30
DanielP DanielP is offline
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Default

are everything set correct with mydomain.tld and FQDN of the server

it easy to get in RBL's with incomplete server setup if you send mails (wiht -f) I got one vbulletin forum which got that function you can manually troubleshoot every reject

You need manually unblock your IP/s from RBLs

http://www.anti-abuse.org/multi-rbl-check/

(but only after problem is solved) there is email by hours limit in cpanel

one solution i found in these forums for ISPConfig and postfix is http://www.policyd.org/

(use forum search for integration tips there are several topics here)

so even some of your sites got hacked and spam is send you can got a policy to be send for example no more than 50 emails per hour or no more than 500 for the day from a domain so yo do not get in trouble with RBLs... or not in big one you can choose lower limits for more paranoid setup
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Last edited by DanielP; 9th December 2013 at 22:34.
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