![]() ![]() This setting can only be enabled only by the organization's Administrator (either in the 'Microsoft 356 Admin Center' for individual/specific users, or via 'PowerShell' if required for an entire organization). It is still possible to use an IMAP account, but in order to fix the ' Authentication Unsuccessful' error, you need to have A uthenticated SMTP enabled in your organization's settings within Microsoft 365. We therefore strongly advise you to use the Exchange protocol which is part of our Business plan to use Microsoft 365 accounts within Mailbird- ultimately, it is much more stable and secure. This problem occurs because SMTP authentication is blocked by default for security reasons inside Microsoft 365's settings by any company making use of it. With Microsoft 365 accounts, the ' Authentication Unsuccessful' error can occur when a Microsoft 365 user tries to send emails whilst IMAP is selected as the server type. ![]()
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