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NDR 5.1.4 and Duplicate Email addresses
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NDR 5.1.4 and Duplicate Email addresses - 23.Aug.2007 6:58:21 AM
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mattdjuk
Posts: 3
Joined: 23.Aug.2007
Status: offline
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Hi,
We currently have a piece of software that creates contacts in AD as they are entered in our website - this side of things works perfectly and contacts are created successfully and are available to email in Outlook.
Issues arise when we have two contacts from our website that share a common an email address i.e. Contact A has an email address of test@test.com, contact B has an email address of test@test.com as well. I know that if you try to enter these by hand in AD it won't let you, however using our code we can do this and contacts are getting added ok.
At this point an Ms Outlook user can send email to either contact by choosing them from the address book, the email gets delivered successfully. The person recieving the email e.g Contact A, can then respond to the original sender and this gets delivered ok. The problem we are getting is at this stage - Should I wish to respond to the email from Contact A (his response to my original email) I will get a bounced back email and an NDR code 5.1.4 - related to the Exchange not being able to associate a unique contact with the email address (because there are two in the system).
The question is... What can I do to prevent this happening other than not allowing duplicate emails through from our website as we need this requirement.
Many thanks
M
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RE: NDR 5.1.4 and Duplicate Email addresses - 23.Aug.2007 9:36:40 AM
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uemurad
Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
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quote:
What can I do to prevent this happening other than not allowing duplicate emails through from our website as we need this requirement Are you saying that you have a requirement to allow duplicate SMTP addresses? How are you expecting Exchange and AD to differentiate them? With external messages, the only routing information available is the SMTP address.
_____________________________
Regards,
Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com
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RE: NDR 5.1.4 and Duplicate Email addresses - 23.Aug.2007 9:59:19 AM
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mattdjuk
Posts: 3
Joined: 23.Aug.2007
Status: offline
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WE're able to input two contacts with the same email address via our website, these then get picked up by a piece of middleware and a contact is created in the GAL - say c1 and c2, both c1 and c2 need to be able to have the email address sales@companyname.com (for example).
The actual creation of these occurs ok and I can then go to outlook and pick them out of my address book and email them. They can then respond back to me. At this point I can't email them back (without removing the address that comes up automatically on clicking the 'reply to' button) because it bounces back with a NDR 5.1.4 message.
Is there anyway to have more than one contact with a generic email address is really what I'm asking.
Many Thanks
M
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RE: NDR 5.1.4 and Duplicate Email addresses - 23.Aug.2007 10:17:09 AM
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uemurad
Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
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quote:
Is there anyway to have more than one contact with a generic email address Hmmm... I can't think of a way around your issue.
When you send a message, Outlook queries AD asking it to resolve the recipients it already knows about. For example, if you type in your own SMTP address and click Check Names, the display will change to your AD object. If there is more than one object with that address, regardless of whether they are simple contact objects, AD user objects, mail-enabled distribution lists, or mail-enabled public folders, AD will complain. AD doesn't like duplicates and that's why ADUC doesn't allow you to reuse an existing address. Even those belonging to disabled accounts.
_____________________________
Regards,
Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com
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RE: NDR 5.1.4 and Duplicate Email addresses - 23.Aug.2007 11:22:03 AM
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mattdjuk
Posts: 3
Joined: 23.Aug.2007
Status: offline
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Going off on a slight tangent... I have since been into the exchange console and opened the properties dialog of one of these contacts that share a generic email. I have gone into the 'email addresses' tab and changed what is saved in here (I believe this is the LDAP property proxyAddresses) to something different. I am now able to send emails to both addresses that get delivered.
My question this time is what possible knock on effect could this have, what is this 'email addresses' tab for?
Thanks again
M
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RE: NDR 5.1.4 and Duplicate Email addresses - 23.Aug.2007 1:13:35 PM
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uemurad
Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline
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The Email Addresses tab shows you the information stored in the "mail" and "proxyAddresses" attributes. In short, proxyAddresses is everything not the primary SMTP address for the object.
If you manually add an address to the Email Addresses tab, it is stored in the proxyAddresses attribute and is subject to the same requirement to be unique within AD.
Any proxyAddress can be used for inbound messages, but only the address in the "mail" attribute can be used for outbound messages (unless you use a 3rd-party product).
_____________________________
Regards,
Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com
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