How can I create a single e-mail account or address that all my domain e-mail users can be reach from outside my domain.

Reaching in the sense of being able to send emails then it is just a matter of creating the distribution list and make sure that it accepts emails from everyone in the DL property. If you meant to being able to access some shared mailbox from internet that really depends on exchange topology. Could you be more specific with your requirement please & what is the exchange server version ? Regards, Pushkal MishrA

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See this article: http://technet.microsoft.com/en-us/library/cc164331%28EXCHG.65%29.aspx NakiNaki K. / Falcon IT Services