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If you mean can you move their MX record so that your Exchange system deals with their domain, yes.<br />
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Exchange 2003;<br />
<a href="http://www.intelliadmin.com/blog/2007/08/add-new-email-domain-to-exchange-2003.html" rel="ugc">http://www.intelliadmin.com/blog/2007/08/add-new-email-domain-to-exchange-2003.html</a><br />
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Exchange 2007;<br />
<a href="http://technet.microsoft.com/en-us/library/aa996314.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/aa996314.aspx</a><br />

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Then change the MX record to point to your MX records for your &quot;main&quot; domain (i.e. mail.company.com) and voila, email shall start flowing into your Exchange :)
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it still would need to continue to work for their mail also.
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thank you, i was not sure if there was something i could do.
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My company is in the process of being acquired by another company and I need to know if I can use their MX record on my exchange server? &nbsp;There will not be any connectivity between the two groups.
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My company is in the process of being acquired by another company and I need to know if I can use their MX record on my exchange server?  There will not be any connectivity between the two groups.

can one MX record be on two servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.