Forum Discussion
vijayabv123
Microsoft
MicrosoftSMTP relay without on-prem Exchange server
Hi Exchange Experts, One of my Customer has following Requirement: They have already migrated all their user mailboxes to Exchange Online. They still have 2 Exchange on prem servers functioning ...
The available options are detailed here: How to set up a multifunction device or application to send email using Microsoft 365 or Office 365 | Microsoft Learn
Due to the TLS requirements, it seems your only option will be to use direct send, which in turn is limited to internal recipients only. While having a static (and public) IP is not a hard requirement for this scenario, you need to configure the SPF record to account for it.