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I am not aware of a way to do an auto-reply for ALL mailboxes. &nbsp;Why not just setup Exchange to receive emails for both the old and new domains? &nbsp;And then you'd just configure the new domain to be the default domain for all the mailboxes and that way when people send out new emails it would be coming from their new address.
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I am not aware of a way to do an auto-reply for ALL mailboxes.  Why not just setup Exchange to receive emails for both the old and new domains?  And then you'd just configure the new domain to be the default domain for all the mailboxes and that way when people send out new emails it would be coming from their new address.

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We are switching our Email domain and would like to notify everyone that sends us an email on our old domain that it is switching to the new domain structure. <br />
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Sort of like an Out of Office message, but I want the sender to get the message every time they email to the old domain until I turn it off.<br />

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We are switching our Email domain and would like to notify everyone that sends us an email on our old domain that it is switching to the new domain structure. 

Sort of like an Out of Office message, but I want the sender to get the message every time they email to the old domain until I turn it off.


Exchange Auto responder

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.

Exchange

Founded in 2001, Exclaimer is the recognized global market leader in on-premises and cloud-based email signature software and solutions for Office 365, Microsoft Exchange and Outlook. It has over 50 million users worldwide with some companies holding licenses for over 100,000 users. Its diverse customer base includes renowned international organizations such as Sony, Mattel, 10 Downing Street, NBC, the Government of Canada, the BBC and many more organizations of all sectors and sizes.

Exclaimer solutions are regularly recommended by Microsoft MVPs (Most Valuable Professionals) and have a strong reputation within the Microsoft community. The company has been the recipient of multiple awards within the IT sphere and has successfully achieved the ISO 27001:2013 Certification for its cloud-based Office 365 signature management service.