Hello, What happens if I change the default accepted domain? It's used [only] for set SMTP address when creating a new mailbox? We are using Exchange 2010. We have an e-mail address directive but, in fact, we set manually the SMTP address when creating a new Mailbox. We have 3 accepted domains: one external, one internal and another one for relay to another mail system inside the organization. Currently, the default domain is the external domain. I would like to set the internal domain as default. Beginners question, I think... but I still couldn't find a answer (I'm still searching).

Read below. No need to serach. http://technet.microsoft.com/en-us/library/bb124423.aspx Sukh

Hi Sukh, Thanks for your fast reply! I read the doc page. It's very interesting and has a lot of information about accepted domain but, unfortunately, it doesn't clarifies (at least for me, a beginner) what can be affected, in the mail service, if I set another accepted domain as default.

Hi The default accepted domain is the domain name that is associated with outbound messages that have encapsulated addresses, such as IMCEANOTES-user+40OtherSystem@contoso.com, for non-Exchange e-mail system interoperability. If you don't have to interoperate with a non-Exchange e-mail system in your organization, you don't have to set this parameter. So in your case if this is not requried there should be no impact. However not sure why you want to do this. You should leave the default domain as it is. Sukh

Hi, Agree with Sukh. Usually, when internal domain name is different from external domain name, we need to create external domain name as accepted domain so that Exchange server can handle emails sending to external domain. Let me give an example. The default accepted domain is A.com and it is internal company domain name. If it is not registered in the public network but we register the XX.com domain name, the users from public network only can send to the XX.com domain. So it needs to configure the accepted domain. First, you can configure an accepted domain as XX.com in EMC according to the steps of the article (http://blog.shareef.info/2010/06/02/configuring-multiple-e-mail-domains-in-exchange-2010/). And also configure Email address policy to apply this new domain SMTP address into all mailboxes. Second, there will be two accepted domains. When someone send an email to B@XX.com, the B@A.com address will receive the same emails. Hope this helps. ThanksPlease 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.

Hi Sukh828, hi Sophia Xu Thank you very much for the clarification! It helped a lot. And sorry about my long delay in responding. I was waiting for a "window" to apply changes on the service. I've changed the default accepted domain (I've set the internal domain as default) and that's all right! "No side effect" :)