EAI Study

What is EAI

• RFC Definition
• How to allow EAI - our solution

Internationalized Email Installation

Base Installation

Supports SMTPUTF8, SMTP Auth (unencrypted & TLS), imap/pop3 (unencrypted &TLS)

Ubuntu

• Short Version - Quick installation (This does not work with NON-ASCII username, can use alias instead)
• Long version - Step by step with explanations (Recommended)

• Sample Config File [ http://tool.ts8.se.in.th/wikieai_en/files/vclass.info_main.cf]

Centos

• Centos - base installation
• Centos - FAQs

Freebsd

• Freesbsd - Long version - Step by step with explanations

Upgrade installation 1

Configure Postfix to automatically add SMTPUTF8 when sending to EAI Address using Pipe Filter

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

Install php5-cli, the script is using PHP

sudo apt-get install php5-cli

get the script and place it in /etc/postfix

   cd /etc/postfix
   sudo wget https://raw.githubusercontent.com/padillareyj/eaifilter/master/eai-add-smtputf8.php

Update ownership and permission

    cd /etc/postfix
    sudo chown root:root eai-add-smtputf8.php
    sudo chmod +x eai-add-smtputf8.php

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

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

Update main.cf

content_filter =eaifilter:[127.0.0.1]:10025

Upgrade installation 2

Configure Postfix to modify sender's email address when sending to Non-EAI enabled mail server using Pipe Filter Make sure you have a working Mail server using the base installation and skipped Upgrade installation 1.

Install php5-cli, the script is using PHP

sudo apt-get install php5-cli

get the script and place it in /etc/postfix

   https://github.com/padillareyj/eaifilter/blob/master/eaifilter.php

This filter will check outgoing mail server, if the server does not support SMTPUTF8, it rewrites the address of the sender to a non-ascii format base on alias mapping.

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/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

Update main.cf

content_filter =eaifilter:[127.0.0.1]:10025

Upgrade installation 3

Multiple virtual domain support Info:

Info:

• You need to have at least a base installation
• MySQL does not work for Virtual Domains, the domain and user return as garbled text in the authentication.
• Virtual Alias Domain is used instead (it works).
• This should work for Ubuntu, Centos and Freebsd

sudo postconf "virtual_alias_domains = yourdomain1.com yourdomain2.com yourdomain3.com youretc.com โดเมนคุณ.ไทย"
sudo postconf "virtual_alias_maps = hash:/etc/postfix/virtual"

edit or create /etc/postfix/virtual

yourdomain1.com                     DOMAIN
someuser@yourdomain1.com            user1

yourdomain2.com                     DOMAIN
anotheruser@yourdomain2.com         user2

yourdomain3.com                     DOMAIN
admin@yourdomain3.com               user3

youretc.com                         DOMAIN
admin@youretc.com                   user1

โดเมนคุณ.ไทย                        DOMAIN
แอดมิน@โดเมนคุณ.ไทย                  user1

Update your changes

sudo postmap /etc/postfix/virtual

Installation	LOCAL EAI	SEND TO NON-EAI AS EAI	RECEIVE EAI MAIL	REPLY TO EAI WITH NON-EAI MAIL CLIENT	REPLY TO EAI BY NON-EAI WEBMAIL	REPLY TO EAI BY MODIFIED WEBMAIL	RECEIVE/REPLY/SEND using Gmail as a Client
Base Installation	NO	NO	YES	NO	NO	YES	YES
Upgrade installation 1	NO	NO	YES	YES *	YES*	YES	YES
Upgrade installation 2	YES	YES	YES	YES*	YES*	YES	YES
Upgrade installation 3	-	-	-	-		YES	YES

 *This will work only if the Mail client will allow a NON-ASCII character or the NON-ASCII character email address will not become garbled.

List of EAI Enabled Mail Client

Outlook 2016   - (Base Installation)Send to EAI as NON EAI (address is copy pasted) - Yes - using Coremail Server as EAI (Receiving)
                 (Base Installation)Receive from EAI as NON EAI - Yes - using Coremail Server as EAI (Receiving)
                 (Base Installation)Reply From EAI as NON EAI - No (The EAI email address is garbled when received) using Coremail Server (Receiving)

List of EAI Enabled Webmail

As the time of writing, there are no Webmail that works.

NONE

NONE

Configuring Gmail to work as a EAI Client

Gmail is the best option to use as a Client.

Configuring Outlook 2016

 More Settings-> Outgoing Server -> Checked - My Outgoing server(SMTP) requires authentication
More Settings-> Advance -> POP3 110, SMTP 25 , Use the following type of encrypted connection TLS

List of Scripts

• Modified Squirrelmail
• EAI Filter Scripts