Category: High Volume Email
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How To Configure High Volume Email Service in Exchange Online (including all the steps)
From 1st March 2026 through to end of April 2026 Microsoft will start to reject some, and eventually all, SMTP AUTH connections (basic or legacy auth to SMTP endpoints) in Exchange Online. This will not affect modern authentication connections using an app registration/Enterprise Application in your tenant nor any login able to do MFA (as…
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Implementing High Volume Email with Exchange Online
High Volume Email (HVE) is a new service from Microsoft to allow the sending of up to 100,000 internal emails per day (with a small number external) which is in excess of the current limits of 10,000 per day (depending upon your licence). Here are my initial observations on setting this service up. During preview…