Exchange Online
Coverage of Exchange Online in the Nexus archive.
- Microsoft Exchange Flaw Lets Attackers Spoof Any Email Address
A flaw in Microsoft Exchange, dubbed 'Ghost-Sender', allows attackers to spoof any email address by exploiting Exchange Online or on-premises systems in hybrid mode with third-party mail servers or spam filters.
- Microsoft Exchange Online outage causes email delays, failures
Microsoft is addressing a service issue affecting the mail flow pipeline for Exchange Online customers in North America and Germany, causing email delays and failures.
- Legacy TLS tour continues with Exchange Online blocking old versions from July 2026
Microsoft will discontinue support for TLS 1.0 and 1.1 on POP3 and IMAP4 connections to Exchange Online by July 2026, urging users to upgrade to newer, more secure TLS versions.
- Microsoft to deprecate legacy TLS in Exchange Online starting July
Microsoft will start blocking legacy TLS connections for POP and IMAP email clients in Exchange Online from July 2026, as part of its efforts to enhance security and modernize protocols.