We are almost finishing the integration project with another email domain. We are planning to set up an automated response for 150+ users for their legacy email addresses.
How do we setup auto response when some one email them on their legacy email address for e.g. firstname.lastname@example.org to be auto responded as this email address no more exist please send email to email@example.com?
this needs to be done for all 150 users. Any idea?
Looking at the drawback i dont think it will be a viable solution. As our requirement is to fire auto response from all 150 users. so Mail flow rule i guess not viable one. Coming back to powershell we want the rule to fire only when it hit legacy address of the email.
Set up a transport rule for messages sent to that mail domain and reject the message with a an explanation why (NDR). There might even be a way to still accept the message and send some form of reply to the sender