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Microsoft Defender for Office 365 Blog
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Strengthening Email Ecosystem: Outlook’s New Requirements for High‐Volume Senders

Puneeth's avatar
Puneeth
Icon for Microsoft rankMicrosoft
Apr 02, 2025

This applies to Outlook.com - our consumer service, which is supporting hotmail.com live.com and outlook.com consumer domain addresses.

April 29th Update - Changes have been made to the action take on messages that do not meet requirements, please see details below. Introduction In an era where email remains one of the most widel...
Updated Apr 30, 2025
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Jane55555's avatar
Jane55555
Copper Contributor
Aug 05, 2025

Thanks, I will pass this to the tech team, but I am not using any templates, I am writing and sending emails from my google workspace email (gmail). In a normal compose screen how do I change the email template for mail-creation in gmail to Base64 Content-Transfer-Encoding? Is this possible? Thanks