we just changed primary smtp address of user from firstname.lastname@example.org to domain.com
when I send an email to user who is in office 365 , I get following auto email reply
Thank you for contacting @domain.com, but it looks like you are using an outdated email address. We are now company, reaching over a quarter billion consumers each month - so please update your contact information with our new domain: @domain1.com.
we are getting this from domain1 AutoReply <email@example.com
so what went wrong