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How to Hide, Avoid or remove Send on behalf message when sending email through Exchange Server 2007

Posted on 2012-04-08
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Last Modified: 2012-04-30
[Current Scenario]


I have setup Microsoft Windows 2008 SBS Server in My Organization. I am using "Adsl Internet Connection" having "Dynamic IP address". Pop3 connector is configured on My SBS 2008 Server so that users received their internet email & Smart host is also configured so that users send email to external internet domains.


[Smart Host]
Smart Host: exmail.emirates.net.ae
Require Authentication: test@abc.ae


[Problem]

Problem is that whenever our users send email to external internet domains, Receiver of other domains receive our message like this "test@abc.ae" on behalf of "George Michael" where George Michael is our user. How we can hide / remove this message and why this message is apearing, whats the reason, even i didnot configure Send on behalf for any user in my domain?


our local domain: dubai.local
our external domain: abc.ae (for example)

Note:
our users can send email locally and externally. we set .ae address as their primary email address so whenever they send email to internet domains mails goes from their primary address.


[Previous Scenario]

[Before we had a static ip on lease line and we were using smart host "mailv.emirates.net.ae" and "mail.emirates.net.ae" and emails from our domains goes to external email domains without having send on behalf message. etisalat dynamic ips are usually black listen in many rbl therefore we cannot use "mail.eim.ae, mail.emirates.net.ae; mailv.emirates.net.ae to relay our emails to external domains].


Note:

if you are using other service provide like "Duo" you can use etisalat smart host "exmail.emirates.net.ae" for sending & receiiving emails.
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Question by:jahangir303
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Assisted Solution

by:Frosty555
Frosty555 earned 500 total points
ID: 37822447
The problem is that you are authenticating as "test@abc.ae" with your smarthost. When the smarthost relays your email it is noticing that your "from" address (George Michael) doesn't match the authenticated user (test@abc.ae), so it is modifying the message header on the way out. This helps your message get relayed and prevents spam filters from concluding that your message has a spoofed "from" address, and rejecting it as spam.

You need a smarthost that lets you properly relay mail for any user in the @abc.ae domain. Talk to your web hosting provider, you should be using their SMTP servers to relay your outbound mail.

Otherwise, you can pay for an email delivery service that can handle this for you.

http://dyn.com/email/
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LVL 31

Accepted Solution

by:
Frosty555 earned 500 total points
ID: 37822453
For your inbound mail, also, I would also suggest that you do NOT use POP3 connectors. It isn't designed to scale to lots of users in Small Business Server. It is intended to be used as a temporary measure while migrating users off your legacy email system.

Instead, you want mail to be delivered directly to your Exchange server.

This is understandably difficult - you have a dynamic IP address, and your Exchange isn't hardened against attack or designed to block spam. For that reason you should use an Email gateway.

You point your MX records to the email gateway so all email is delivered directly to them. The gateway scans your email for spam, viruses etc, and forwards the clean ones to your exchange server. Your exchange server accepts mail only from the Email Gateway and nowhere else, preferably on a nonstandard port (e.g. 2525). If your Exchange server (or the Internet, or your power etc.) ever goes down, the Email Gateway will store the incoming mail, and then forward it all later when it is back up.

You can get around your dynamic IP address issue by using DynDNS's dynamic DNS services so that your server is reachable via a dynamic hostname, such as abccompany.dyndns.org, and install the DynDNS updater on your server to keep that hostname updated with your latest dynamic IP address.

http://dyn.com/email/dyn-email-gateway/

https://account.dyn.com/entrance/
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