If you’ve got some PowerShell scripts that send emails, it’s time to upgrade them to use the Microsoft Graph API or the Microsoft Graph PowerShell SDK. The SMTP AUTH protocol remains an exception to allow customers more time to upgrade devices and code which use the protocol to send email via Exchange Online.
In other tenants, where some protocols (like ActiveSync are actively using basic authentication), they are busily disabling unused protocols, like POP3 and IMAP4.
In line with their plan to remove basic authentication for all tenants on 1 October 2022, Microsoft has already disabled basic authentication in many Microsoft 365 tenants. Microsoft very badly wants to remove basic authentication for Exchange connection protocols. In fact, because Apple makes it so easy to transfer data and settings from an old to a new device, they have faithfully transferred many old mail profiles to spanking new iPhone 11, 12, and 13 devices over the last few years. Instead, it’s because the user profiles for the Mail app are old and specify basic authentication. This isn’t because the Apple client doesn’t know how to support OAuth authentication flows (the necessary code is available from iOS 12 on). Last year I wrote about the need to upgrade the Apple iOS Mail app on some devices to deal with Microsoft’s phasing out of basic authentication. Upgrade Mail App Profiles for Modern Authentication
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