My company wants to switch email addresses from firstname.lastname@example.org to email@example.com for each employee in the organization stored in Active Directory in Exchange Server 2003. They also want to create aliases in Exchange Server to map the old email address while moving to the new email address format. Is there a best method to create these aliases on Exchange Server without disturbing the working environment?
The best way to achieve this is to create a secondary SMTP proxy address in the firstname.lastname@example.org format to the email address policy for the organization. This will stamp all of the users with email addresses in the email@example.com format. Once that has been done you can use "Set as Primary" to set this as the reply-to address format for all email leaving your organization so that they start showing up in that format.
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