Hi, I have a client that has an on prem Exchange server. They have 8 or so domains. Each user at the company can receive email at any of the domains, into their primary mailbox and reply as the user the email it was sent to, without having to select reply as or anything else (Using Exclaimer Send As tool). They can also create new emails from any of the domains by selecting a dropdown (Exclaimer add in).
All of this works ok, except when users are not using outlook with the add in installed (OWA, cell phone, etc.)
Client is considering moving to O365 Hosted Exchange but does not want to lose this functionality. And furthermore would like to be able to do the same from OWA and cell phones.
Has anyone seen a solution to this that is compatible with O365 Hosted Exchange?