We're looking at Exchange Online as well, and also have a Barracuda mail archiver. IIRC, the Barracuda has to go, and there's no two ways about it. You lose the option to do mail-flow stuff in ...

Exchange Online users soon will be getting some security enhancements that will enforce the use of Transport Layer Security (TLS) encryption for e-mails and ward off so-called 'man-in-the-middle ...

A Microsoft 365 outage is preventing Exchange Online users from sending and receiving emails, with messages being stuck in transit and not reaching the recipients' inboxes.

Microsoft announced today that inbound SMTP DANE with DNSSEC for Exchange Online, a new capability to boost email security and integrity, is now generally available.