View source for Linux/Mailserver/Internet Site

== Requirements ==
* Ubuntu 16.04
* server with static ip
* control of dns entries

= Spam filtering =
== Installation ==
* install
<blockquote>
<pre>
apt install postgrey postfix-policyd-spf-python spamassassin spamass-milter clamav-milter
</pre>
</blockquote>


* edit /etc/postfix/main.cf
<blockquote>
<pre>
smtpd_client_restrictions = 
        permit_mynetworks, permit_sasl_authenticated,
        reject_unauth_pipelining,

smtpd_helo_required = yes
smtpd_helo_restrictions = 
        permit_mynetworks,
        reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname

smtpd_sender_restrictions = 
        permit_mynetworks,
        reject_non_fqdn_sender, reject_unknown_sender_domain,

smtpd_relay_restrictions = 
        permit_mynetworks, permit_sasl_authenticated,
        reject_unauth_destination,

smtpd_recipient_restrictions =
        permit_sasl_authenticated,
        reject_non_fqdn_recipient,
        reject_unknown_recipient_domain,
        reject_invalid_hostname,
        reject_non_fqdn_hostname,
        reject_non_fqdn_sender,
        reject_unknown_sender_domain,
        permit_mynetworks,
        reject_rbl_client zen.spamhaus.org,
        reject_rhsbl_reverse_client dbl.spamhaus.org,
        reject_rhsbl_helo dbl.spamhaus.org,
        reject_rhsbl_sender dbl.spamhaus.org,
        check_policy_service unix:private/policy-spf
            # check SPF of remote mail server
        check_policy_service inet:127.0.0.1:10023,
            # check with postgrey    
        permit

policy-spf_time_limit = 3600s
</pre>
</blockquote>

== Postgrey ==


* edit /etc/default/postgrey
<blockquote>
<pre>
POSTGREY_OPTS="--inet=10023 --delay=60"
</pre>
</blockquote>

* restart
<blockquote>
<pre>
systemctl restart postgrey
</pre>
</blockquote>

== Postfix-policyd-spf-python ==
* add to end of /etc/postfix/master.cf
<blockquote>
<pre>
policy-spf unix  -       n       n       -       -       spawn
     user=nobody argv=/usr/bin/policyd-spf
</pre>
</blockquote>

== spamassassin ==
* add to /etc/postfix/main.cf 
<blockquote>
<pre>
smtpd_milters = unix:/spamass/spamass.sock
                    # spamassassin
</pre>
</blockquote>



== clam-av ==
* add to /etc/postfix/main.cf 
<blockquote>
<pre>
smtpd_milters = unix:/clamav/clamav-milter.ctl
                    # clam-av virus scan

milter_connect_macros="i j {daemon_name} v {if_name} _"
</pre>
</blockquote>

* change /etc/clamav/clamav-milter.conf
<blockquote>
<pre>
MilterSocket /var/spool/postfix/clamav/clamav-milter.ctl
MilterSocketGroup postfix
</pre>
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