Outlook Autodiscover Login prompts, email forwarding

i have an on premise Exchange 2010 server.  We recently acquired a company that is on their own hosted exchange system.  Their email domain in @newco.com.  While we go through the integration process we need them to start receiving email from our domain name @alto.com  and also replying from the @alto.com domain.

in order to achieve this, on my internal Exchange 2010 server,  i have setup a mail contact for each person with their FirstLast@newco.com email as the SMTP External Email address as well as an SMTP email FirtstLast@alto.com for our domain.  Emails that are sent to the @alto.com address get forwarded out to the external email address @newco.com.  On newco.com's end, they have set their primary reply address to FirstLast@alto.com.  From a mail flow standpoint this is working correctly.

There is one issue that is happening to PC's running Outlook.  When the user first logs into their outlook mailbox they use the firstlast@newco.com username and password to login.  Once logged in, however, they are getting constant login prompts to Connect To Autodiscover.alto.com.  Since they don't have credentials on the alto.com domain there is nothing to log into.  If they hit cancel email function continues to work fine emails works fine but the prompt will come up again and again and again forcing them to clear or cancel each time.

Is there a way to stop the prompts or set things up in a way to stop the prompts.

Thank you.
AVnbmAsked:
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Simon Butler (Sembee)ConsultantCommented:
That is Autodiscover doing its job.
You cannot stop the prompts centrally - you will have to set it on each client.
This KB article at Microsoft explains how to do that with the registry and group policy.
https://support2.microsoft.com/default.aspx?kbid=2612922

You will need to reverse the change when the clients come on to your domain.

Simon.
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AVnbmAuthor Commented:
Hi Simon

exactly what i was looking for.  Thank you!
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