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“Ghost-Sender" is the result of a widespread misconfiguration, according to researchers, and evidence indicates it's being actively abused in the wild.
Microsoft is working to address a widespread service issue affecting the mail flow pipeline for Exchange Online customers across North America and Germany. [...]
Microsoft says it will start blocking legacy TLS connections for POP and IMAP email clients in Exchange Online starting in July 2026. [...]
Microsoft is working to address an ongoing service issue that has intermittently prevented some users from accessing their cloud-based Exchange Online mailboxes via Outlook mobile and Mac desktop clients since Thursday. [...]
Negative feedback sinks Redmond's plan to cap outbound email recipients Microsoft has backed away from planned changes to Exchange Online after customers objected to limits designed to curb outbound email abuse.…
Microsoft announced today that it has canceled plans to impose a daily limit of 2,000 external recipients on Exchange Online bulk email senders. [...]
Microsoft announced on Monday that it will soon block mobile devices running outdated email software from accessing Exchange Online services until they're updated. [...]
Microsoft is enabling threshold-based auto-archiving by default in Exchange Online to prevent email flow issues caused by mailboxes filling up faster than expected. [...]
Microsoft is investigating a known issue that causes the classic Outlook email client to crash upon launch, which can only be resolved via Exchange Online support. [...]
Microsoft is working to resolve an Exchange Online issue causing email access problems for Outlook mobile users who use Hybrid Modern Authentication (HMA). [...]
Microsoft says its Defender for Office 365 cloud-based email security suite will now automatically detect and block email bombing attacks. [...]
Microsoft says it partially mitigated a week-long Exchange Online outage causing delays or failures when sending or receiving email messages. [...]
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. [...]
'It's not our job to find the culprits – That's what we're paying you for' lawmaker scolds Brad Smith Lawmakers on Thursday grilled Microsoft president Brad Smith about the Windows giant's businesses dealing in China — and the super-corp's repeated security failings — at a time when Beijing-backed spies are accused of breaking into Microsoft-hosted email accounts of American government officials.…
The new Secure Alternative Program from Google aims to entice customers away from Exchange Online and break Microsoft's dominance in enterprise.
Microsoft has announced plans to fight spam by imposing a daily Exchange Online bulk email limit of 2,000 external recipients starting January 2025. [...]
CISA calls for 'fundamental, security-focused reforms' to happen ASAP, delaying work on other software A review of the June 2023 attack on Microsoft's Exchange Online hosted email service – which saw accounts used by senior US officials compromised by a China-linked group called "Storm-0558" – has found that the incident would have been preventable save for Microsoft's lax infosec culture and sub-par cloud security precautions.…
CISA calls for 'fundamental, security-focused reforms' to happen ASAP, delaying work on other software A review of the June 2023 attack on Microsoft's Exchange Online hosted email service – which saw accounts used by senior US officials compromised by a China-linked group called "Storm-0558" – has found that the incident would have been preventable save for Microsoft's lax infosec culture and sub-par cloud security precautions.…