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Mail from external to Distribution List wil not distribute to external address.

Posted on 2006-11-15
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Last Modified: 2008-02-01
Hello Experts,

I hope you can solve this problem we have.
> Server 2003 Standard, Exchange 2003, single domain.

We have external people (no domain users) who needs to have a domain emailaddress (user@ourdomain.com) en got this email adres redirect to there own private address (user@ISPDomain).
I made a contact for this person in the AD
And I made a distribution group for this user, made the contact member of this distribution group.
Well what happens is that when I send an email from the internal domain to this distribution list > JUST OK! person gets the email in his private mailbox.

But when I send from an external account to this distribution group I got the following message back:

This is an automatically generated Delivery Status Notification.
---
Delivery to the following recipients failed.

      user@ISPDomain.com

Final-Recipient: rfc822;user@ISPDomain.com
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;554 <externalaccount@ISPDomain.com>: Sender address rejected: Access denied
X-Display-Name: Johanvb
---
Is this a policy in Exchange 2003?

Please can anyone help us out here since we need to use the option that people can mail the person on our domain address en get the email to any address we want.(private).


Thanks a lot,

Johan van Bruksvoort
Holland
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Question by:johanvanb
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Expert Comment

by:Sembee
ID: 17946673
This is becoming common problem, and while it is an issue with Exchange, it isn't Exchange that is causing it.

When the external person sends the email to the distribution list, Exchange distributes the email to the list leaving the From line intact. This is for internal users. However for external users this means that the email is being delivered by a server that is not responsible for email for that domain.
The recipient's server looks at the From field and then the server that is sending the message and rejects the message. To the recipient server it looks like spoofing - and as well all know, most spam and viruses have senders that are spoofed.

If you send to the contact directly from outside you may find that you have same the problem.

Simon.
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Author Comment

by:johanvanb
ID: 17946820
Thanks for the answer Sembee,

I understand what you are pointing at. It sound logical. But if you want a simpel solution like this how are other companys dealing with this?

Can Microsoft do something about it?
And what is the alternative to give outside people a domain emailaddress wich is forwarded to their internet email account. Should be simpel but... how?

Thanks in Advance..
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Accepted Solution

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Sembee earned 500 total points
ID: 17947166
Forwarding to external accounts isn't done by large companies. I can only think of one of my clients who does that.
Most of them operate the practise that if you want someone to have an email address on your domain then they collect email from the account - usually by OWA. This gives them control over the use of their domain and they can control access to it.

The simple question that I ask the clients is do you want everything that is sent to that person sent over the internet to some account somewhere, where you have no idea who is accessing it, who is reading it and what is happening to the message.
While the recipient may not be receiving anything commercially confidential, if a mistake is made then that is the item out of the door. At least on accounts that are all internal you can control the distribution and remove the item.

There is very little that you can do about it. Microsoft are not going to change the behaviour of their product - they haven't done so in Exchange 2007 so it will not happen for at least another five or six years.

Simon.
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