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http://guides.thnic.or.th/eai-setup-guidelines/index.php/Main_Page

eaifilter

EAI filter for postfix

This filter check for the receiving mail server if it supports SMTPUTF8, if it does not support it will rewrite the FROM Address with ASCII only that is aliased to the sender email.

How to use

Copy eaifilter.php in /etc/postfix Change to root

master.cf

smtp      inet  n       -       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/eaifilter.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

main.cf

eaifilter_destination_recipient_limit=1