Forum Discussion
Migrate Zimbra to Exchange Online
Hi all, Im going to migrate Zimbra to Office 365. So have to configure mail flow coexisting between Office and Zimbra for user in 2 email system can send message to each other. Both of Zimbra and O...
Zimbra is believing that you are spoofing the domain name, so you would need to ask them to allow emails originating from Office 365 to be permitted senders.