Outlook.com and Hotmail users face email delivery issues
Since November 5, Microsoft's email services have been rejecting some incoming messages due to authentication verification errors.
Users of Outlook.com and Hotmail are reporting disruptions in receiving emails. Some messages are being returned to senders with an SPF verification error, even if the domains have correct SPF, DKIM, and DMARC settings.
According to users, the issue affects only some messages and may depend on the Microsoft server receiving the email. In certain cases, resending helps restore delivery, though messages may also arrive with a delay.
The failure is not limited to Microsoft 365 clients: difficulties also arise when sending emails through third-party services, including Zoho.
Microsoft has not yet explained the causes of the issue. Users encountering the error are advised to check their domain authentication settings and contact their email provider.
