ดูต้นฉบับสำหรับ Upgrade installation 1

Make sure you have a working Mail server using the base installation


Install php5-cli, the script is using  PHP
<syntaxhighlight lang="bash">
sudo apt-get install php5-cli
</syntaxhighlight>

get the script and place it in /etc/postfix
<syntaxhighlight lang="bash">
   cd /etc/postfix
   sudo wget https://raw.githubusercontent.com/padillareyj/eaifilter/master/eai-add-smtputf8.php
</syntaxhighlight>

Update ownership and permission
<syntaxhighlight lang="bash">
    cd /etc/postfix
    sudo chown root:root eai-add-smtputf8.php
    sudo chmod +x eai-add-smtputf8.php
</syntaxhighlight>

Update your master.cf, the following will filter all incoming mail coming from port 25 and resend to port 10025(accessible locally only), It will append the SMPTUTF8 in MAIL FROM command is executed. MAIL FROM: <MAIL> SMPTUTF8 
<syntaxhighlight lang="bash">
smtp      inet  n       -       -       -       -       smtpd -o content_filter=eaifilter -o receive_override_options=no_header_body_checks
eaifilter unix - n n - - pipe flags=RXhu user=nobody argv=/etc/postfix/eai-add-smtputf8.php -f ${sender} -d ${recipient}
127.0.0.1:10025   inet  n       -       n       -       -        smtpd
        -o content_filter=
        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks,no_milters
        -o smtpd_helo_required=no
        -o smtpd_helo_restrictions=
        -o smtpd_data_restrictions=
        -o smtpd_client_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o mynetworks_style=host
        -o in_flow_delay=0
</syntaxhighlight>


Update main.cf
<syntaxhighlight lang="bash">
content_filter =eaifilter:[127.0.0.1]:10025
</syntaxhighlight>