We are running Exchange 2013 in a Hybrid Enviroment with Office 365 and we want to send all mails via Exchange Online. If we use the Outbound to Office 365 connector for all addresses (adding * at address space) we get the errormessage "451 4.4 0 primary target ip address responded with 454 4.7.5 Certificate validation failure."
What is the correct way to send all mails via Exchange Online or is that not possible?