Hello, I have serveral contacts configured in my exchange system. These are used to allow external recipients to be included in distribution groups. The outgoing mail process is fine however when one of these external recipients replies to a message their display name is resolved to the a matching contact's display name. I don't want this behavior. If the sender makes changes to their mail account's display those changes are not reflected on any received mail. When I provisined the contacts they were all configured as hidden from the GAL, and their display name was set to a GUID value. Their only intended purpose was, as stated above, to allow external recipients on Distribution groups. Can someone give me a method for stopping the resolution for inbound mail? I believe this is P2 address resolution correct? Thanks Bill

You didn't mention the Exchange version? If it's pre-2007 do you have ResolveP2 enabled? If it's 2007 or later do you have Externally Secured enabled as an option on your Receive Connector? (http://blogs.technet.com/b/exchange/archive/2006/12/28/3397620.aspx) Disable the appropriate option to prevent the behavior if you do.

Hi Bill, Do you mean the external user which is added as a contact in your own exchange system reply a email to your domain users, and the external user would be resolve to the displayname of the contact? If So, it seems expected; and if you have changed the displayname , we could delete the cache on the client end, and then it will be resolved as the new GUID value. If I misunderstand your issue, please tell me. Regards! Gavin TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hello, What I am trying to prevent is: A message received by exchange that matches a contact the message is not just relayed to the target address. The address is altered to match the target address (P2 Resolution). If I have a contact with more than one proxy address I would like the message to simply be sent to the target address without any modificatons to the origional To: address. Presumably the message got to the contact because the P1 address matached the contact proxy address but exchange is rewriting the message in such a way that it appears to have been to the target address. While this may be desireable in some instances in my application it is not. It would be very nice to be able to turn off P2 addressing on a recipient by recipient basis. I have a non-exchange list server that manages E-Lists. I have setup contacts representing each list so that the lists appear in the GAL. However when a user sends to one of these it is resolved to the routing address of the list rather than being left as the user had origionally sent it. xyz@domain.com is chnaged to xyz@list.domain.com where xyz@domain.com is a proxy address and xyz@list.domain.com is the target address. I don't really ever want to see the list.domain.com address. Its purpose is to route the mail external of exchange. Bill

Hi Bill, Could you please describle more detailed about your exchange email system? In fact, I am confused about your description. 1. what is you domain name 2. what is your smtp address name 3. how do you configure the contact 4. what about your application Understanding the contact: http://technet.microsoft.com/en-us/library/aa998858.aspx Regards! Gavin TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.