Policies for replacing existing email addresses

Exchange 2010 sp3
i currently don't have yet a test server so i'm hoping someone can give me a hint.
if i change an existing email address policy from "oldDOMAIN.com" to "newDOMAIN.com", will it change all existing email addresses that have "@oldDOMAIN.com" to "@newDOMAIN.com"?

if i change an existing email address policy from "oldDOMAIN.com" to "newDOMAIN.com", will it change all existing email addresses that have "@oldDOMAIN.com" to "@newDOMAIN.com"?
Hi,
Yes,if you change the email address policy,all existing email addresses will been changed.
The following articles for your reference:
Understanding E-Mail Address Policies
Edit an E-Mail Address Policy
Thanks.
Niko Cheng
TechNet Community Support

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