
Microsoft Extends Basic Authentication for High Volume Email in Microsoft 365
Microsoft has officially declared that the High Volume Email (HVE) feature within Microsoft 365 will continue to implement basic authentication until September 2028. This extension is designed to provide businesses with ample time to transition to more secure authentication methods, such as OAuth. However, it’s important to note that certain functionalities related to HVE will be removed, which we will discuss shortly.
Key Changes to High Volume Email Functionality
Starting next month, users will no longer be permitted to utilize HVE for sending emails to external recipients. The function will now focus solely on internal communications within the same tenant. In a recent statement, Microsoft explained:
“This change is intended to simplify our email offerings and clearly define HVE’s purpose within the Microsoft 365 ecosystem.”
Recommendations for External Email Needs
For organizations that still require the ability to send HVE messages to external recipients, Microsoft is recommending the use of Azure Communication Services (ACS) as an alternative solution for email communications.
New Simplifications and Enhanced Capabilities
On a more positive note, Microsoft announced the removal of restrictions on the number of HVE accounts and the internal recipient rate limits, which have been in effect since April 2024 for users in the preview phase. Under the new guidelines, organizations can create up to 100 HVE accounts, and the internal recipient rate limits will be entirely lifted.
Moving Towards Modern Authentication
The key takeaway from this announcement is the three-year extension of Basic Authentication support. While this may seem generous, Microsoft strongly encourages organizations to transition to modern authentication techniques as soon as possible to enhance their security posture. The deadline extension acknowledges that not all organizations are prepared for an immediate shift, making it easier for them to adapt without abrupt disruptions.
For further details, you can access the full announcement through the following link: Source & Images.
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