I am trying to build an email migration project where I will move accounts from agore@company.com to al.gore@company.com but I want to move from a local ISP to Office365 at the same time.
If I setup Office365 though, without making changes to my DNS records, any existing Office365 client sees that I am an office365 account and the emails stop working. I get a bounceback saying that my IP is not allowed to send email from company.com and I suspect it is because Offiec365 is expecting to be the owner of that company.com domain.
Is there a way to setup an office365 account and prep all the accounts without telling other office365 clients that we are live yet?
