Based on
https://tools.ietf.org/html/rfc2821#section-2.3.10
 
and
 
https://tools.ietf.org/html/rfc2822 

3.4.1. Addr-spec specification

 
An addr-spec is a specific Internet identifier that contains a
   locally interpreted string followed by the at-sign character ("@",
   ASCII value 64) followed by an Internet domain.

addr-spec       =       local-part "@" domain

local-part      =       dot-atom / quoted-string / obs-local-part

domain          =       dot-atom / domain-literal / obs-domain
 
 
EAI protocol extends local-part and domain-part to allow Unicode characters,but it does not change the order. That means that  local part is still in left, and
domain part is still in right.
 
 
 
Jiankang Yao
 
From: Raed Al-Fayez
Date: 2017-04-05 06:09
To: Don Hollander; ua-eai@icann.org
CC: Andrew Sullivan
Subject: Re: [UA-EAI] arabic1.arabic2@arabic3.arabic4

Dear Don and All,


Thanks for raising up this important issue.


Similar to an ASCII email address, an Arabic email address consists of a local part and a domain name separated by "@" sign, in the following format (read RTL):

tld.domain@last.first

رائد.الفايز@رسيل.السعودية

 

Here is a list of (8) examples that illustrate how email addresses (ASCII or Arabic) are displayed in English or Arabic text with RTL or LTR display modes (assuming my ascii email is raed.alfayez@raseel.sa):

Case

Example

1.       Arabic text that contains my Arabic email in RTL display mode (right alignment)

هذا نص عربي يحتوي على عنوان بريد إلكتروني عربي رائد.الفايز@رسيل.السعودية ويظهر بشكل جيد عندما يكون اتجاه العرض من اليمين إلى اليسار

 

2.       Arabic text that contains my Arabic email in LTR display (left alignment)

هذا نص عربي يحتوي على عنوان بريد إلكتروني عربي رائد.الفايز@رسيل.السعودية ويظهر أيضا بشكل جيد عندما يكون اتجاه العرض من اليسار إلى اليمين

 

3.       Arabic text that contains my ASCII email in RTL display mode (right alignment)

هذا نص عربي يحتوي على عنوان بريد إلكتروني لاتيني raed.alfayez@raseel.sa ويظهر بشكل جيد عندما يكون اتجاه العرض من اليمين إلى اليسار

4.       Arabic text that contains my ASCII email in LTR display (left alignment)

 هذا نص عربي يحتوي على عنوان بريد إلكتروني لاتيني raed.alfayez@raseel.sa  ويظهر بشكل متداخل عندما يكون اتجاه العرض من اليسار إلى اليمين

5.       English text that contains my Arabic email in RTL display (right alignment)

This is English text with an Arabic email address رائد.الفايز@رسيل.السعودية that appears mixed when displayed from right-to-left

 

6.       English text that contains my Arabic email in LTR display (left alignment)

This is an English text with an Arabic email address رائد.الفايز@رسيل.السعودية that appears  normal when displayed from left to right

 

7.       English text that contains my ASCII email in RTL display (right alignment)

This is an English text with an ASCII email address raed.alfayez@raseel.sa that appears also normal when displayed from right to left

8.       English text that contains my ASCII email in LTR display (left alignment)

This is an English text with an ASCII email address raed.alfayez@raseel.sa that appears also normal when displayed from left to right

 

Therefore, I expect that my Arabic email address (رائد.الفايز@رسيل.السعودية) maintains its appearance regardless of the text language or direction of the display. Otherwise, users (readers) will get confuse.


Note: I am attaching a pdf version of my original message in case it was miss-displayed by any email client.

 

Raed

From: Don Hollander [don.hollander@icann.org]
Sent: Tuesday, April 04, 2017 12:10 AM
To: ua-eai@icann.org
Cc: Raed Al-Fayez; Andrew Sullivan
Subject: arabic1.arabic2@arabic3.arabic4

Dear all:

 

In the above example, which is the mailbox name and which is the domain name?

 

Andrew Sullivan tells me it’s not addressed by the protocol because it’s an implementation issue.

 

Raed:  How does Raseel handle this?

 

Don