Virtual Users And Domains With Postfix, Courier And MySQL (Ubuntu 7.10) - Page 4
This tutorial exists for these OS versions
- Ubuntu 13.10 (Saucy Salamander)
- Ubuntu 14.04 LTS (Trusty Tahr)
- Ubuntu 12.10 (Quantal Quetzal)
- Ubuntu 12.04 LTS (Precise Pangolin)
- Ubuntu 11.10 (Oneiric Ocelot)
- Ubuntu 11.04 (Natty Narwhal)
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9 Install amavisd-new, SpamAssassin, And ClamAV
To install amavisd-new, spamassassin and clamav, run the following command:
apt-get install amavisd-new spamassassin clamav clamav-daemon zoo unzip bzip2 unzoo libnet-ph-perl libnet-snpp-perl libnet-telnet-perl nomarch lzop pax
Afterwards we must configure amavisd-new. The configuration is split up in various files which reside in the /etc/amavis/conf.d directory. Take a look at each of them to become familiar with the configuration. Most settings are fine, however we must modify three files:
First we must enable ClamAV and SpamAssassin in /etc/amavis/conf.d/15-content_filter_mode by uncommenting the @bypass_virus_checks_maps and the @bypass_spam_checks_maps lines:
vi /etc/amavis/conf.d/15-content_filter_mode
The file should look like this:
use strict; # You can modify this file to re-enable SPAM checking through spamassassin # and to re-enable antivirus checking. # # Default antivirus checking mode # Uncomment the two lines below to enable it back # @bypass_virus_checks_maps = ( \%bypass_virus_checks, \@bypass_virus_checks_acl, \$bypass_virus_checks_re); # # Default SPAM checking mode # Uncomment the two lines below to enable it back # @bypass_spam_checks_maps = ( \%bypass_spam_checks, \@bypass_spam_checks_acl, \$bypass_spam_checks_re); 1; # insure a defined return |
And then you should take a look at the spam settings and the actions for spam-/virus-mails in /etc/amavis/conf.d/20-debian_defaults. There's no need to change anything if the default settings are ok for you. The file contains many explanations so there's no need to explain the settings here:
vi /etc/amavis/conf.d/20-debian_defaults
[...] $QUARANTINEDIR = "$MYHOME/virusmails"; $log_recip_templ = undef; # disable by-recipient level-0 log entries $DO_SYSLOG = 1; # log via syslogd (preferred) $syslog_ident = 'amavis'; # syslog ident tag, prepended to all messages $syslog_facility = 'mail'; $syslog_priority = 'debug'; # switch to info to drop debug output, etc $enable_db = 1; # enable use of BerkeleyDB/libdb (SNMP and nanny) $enable_global_cache = 1; # enable use of libdb-based cache if $enable_db=1 $inet_socket_port = 10024; # default listenting socket $sa_spam_subject_tag = '***SPAM*** '; $sa_tag_level_deflt = 2.0; # add spam info headers if at, or above that level $sa_tag2_level_deflt = 6.31; # add 'spam detected' headers at that level $sa_kill_level_deflt = 6.31; # triggers spam evasive actions $sa_dsn_cutoff_level = 10; # spam level beyond which a DSN is not sent $sa_mail_body_size_limit = 200*1024; # don't waste time on SA if mail is larger $sa_local_tests_only = 0; # only tests which do not require internet access? [...] $final_virus_destiny = D_DISCARD; # (data not lost, see virus quarantine) $final_banned_destiny = D_BOUNCE; # D_REJECT when front-end MTA $final_spam_destiny = D_BOUNCE; $final_bad_header_destiny = D_PASS; # False-positive prone (for spam) [...] |
Finally, edit /etc/amavis/conf.d/50-user and add the line $pax='pax'; in the middle:
vi /etc/amavis/conf.d/50-user
use strict; # # Place your configuration directives here. They will override those in # earlier files. # # See /usr/share/doc/amavisd-new/ for documentation and examples of # the directives you can use in this file # $pax='pax'; #------------ Do not modify anything below this line ------------- 1; # insure a defined return |
Afterwards, run these commands to add the clamav user to the amavis group and to restart amavisd-new and ClamAV:
adduser clamav amavis
/etc/init.d/amavis restart
/etc/init.d/clamav-daemon restart
/etc/init.d/clamav-freshclam restart
Now we have to configure Postfix to pipe incoming email through amavisd-new:
postconf -e 'content_filter = amavis:[127.0.0.1]:10024'
postconf -e 'receive_override_options = no_address_mappings'
Afterwards append the following lines to /etc/postfix/master.cf:
vi /etc/postfix/master.cf
[...] 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 |
Then restart Postfix:
/etc/init.d/postfix restart
Now run
netstat -tap
and you should see Postfix (master) listening on port 25 (smtp) and 10025, and amavisd-new on port 10024:
root@server1:/etc/postfix# netstat -tap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 localhost.localdo:10024 *:* LISTEN 14770/amavisd (mast
tcp 0 0 localhost.localdo:10025 *:* LISTEN 15800/master
tcp 0 0 localhost.localdo:mysql *:* LISTEN 5742/mysqld
tcp 0 0 *:smtp *:* LISTEN 15800/master
tcp6 0 0 *:imaps *:* LISTEN 13290/couriertcpd
tcp6 0 0 *:pop3s *:* LISTEN 13359/couriertcpd
tcp6 0 0 *:pop3 *:* LISTEN 13320/couriertcpd
tcp6 0 0 *:imap2 *:* LISTEN 13253/couriertcpd
tcp6 0 0 *:www *:* LISTEN 4961/apache2
tcp6 0 0 *:ssh *:* LISTEN 3725/sshd
tcp6 0 0 server1.example.com:ssh ::ffff:192.168.0.2:4670 ESTABLISHED3783/0
root@server1:/etc/postfix#
10 Install Razor, Pyzor And DCC And Configure SpamAssassin
Razor, Pyzor and DCC are spamfilters that use a collaborative filtering network. To install them, run
apt-get install razor pyzor dcc-client
Now we have to tell SpamAssassin to use these three programs. Edit /etc/spamassassin/local.cf and add the following lines to it:
vi /etc/spamassassin/local.cf
[...] #dcc use_dcc 1 dcc_path /usr/bin/dccproc #pyzor use_pyzor 1 pyzor_path /usr/bin/pyzor #razor use_razor2 1 razor_config /etc/razor/razor-agent.conf #bayes use_bayes 1 use_bayes_rules 1 bayes_auto_learn 1 |
Then we must enable the DCC plugin in SpamAssassin. Open /etc/spamassassin/v310.pre and uncomment the loadplugin Mail::SpamAssassin::Plugin::DCC line:
vi /etc/spamassassin/v310.pre
# This is the right place to customize your installation of SpamAssassin. # # See 'perldoc Mail::SpamAssassin::Conf' for details of what can be # tweaked. # # This file was installed during the installation of SpamAssassin 3.1.0, # and contains plugin loading commands for the new plugins added in that # release. It will not be overwritten during future SpamAssassin installs, # so you can modify it to enable some disabled-by-default plugins below, # if you so wish. # # There are now multiple files read to enable plugins in the # /etc/mail/spamassassin directory; previously only one, "init.pre" was # read. Now both "init.pre", "v310.pre", and any other files ending in # ".pre" will be read. As future releases are made, new plugins will be # added to new files, named according to the release they're added in. ########################################################################### # DCC - perform DCC message checks. # # DCC is disabled here because it is not open source. See the DCC # license for more details. # loadplugin Mail::SpamAssassin::Plugin::DCC # Pyzor - perform Pyzor message checks. # loadplugin Mail::SpamAssassin::Plugin::Pyzor # Razor2 - perform Razor2 message checks. # loadplugin Mail::SpamAssassin::Plugin::Razor2 # SpamCop - perform SpamCop message reporting # loadplugin Mail::SpamAssassin::Plugin::SpamCop # AntiVirus - some simple anti-virus checks, this is not a replacement # for an anti-virus filter like Clam AntiVirus # #loadplugin Mail::SpamAssassin::Plugin::AntiVirus # AWL - do auto-whitelist checks # loadplugin Mail::SpamAssassin::Plugin::AWL # AutoLearnThreshold - threshold-based discriminator for Bayes auto-learning # loadplugin Mail::SpamAssassin::Plugin::AutoLearnThreshold # TextCat - language guesser # #loadplugin Mail::SpamAssassin::Plugin::TextCat # AccessDB - lookup from-addresses in access database # #loadplugin Mail::SpamAssassin::Plugin::AccessDB # WhitelistSubject - Whitelist/Blacklist certain subject regular expressions # loadplugin Mail::SpamAssassin::Plugin::WhiteListSubject ########################################################################### # experimental plugins # DomainKeys - perform DomainKeys verification # # External modules required for use, see INSTALL for more information. # Note that this may be redundant if you also plan to use the DKIM plugin. # #loadplugin Mail::SpamAssassin::Plugin::DomainKeys # MIMEHeader - apply regexp rules against MIME headers in the message # loadplugin Mail::SpamAssassin::Plugin::MIMEHeader # ReplaceTags # loadplugin Mail::SpamAssassin::Plugin::ReplaceTags |
You can check your SpamAssassin configuration by executing:
spamassassin --lint
It shouldn't show any errors.
Restart amavisd-new afterwards:
/etc/init.d/amavis restart