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Exchange Online
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
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Thank you for reaching out to the Microsoft Q&A forum and for sharing your issue.
Based on your description, where all incoming emails are being marked as spam after the migration to Microsoft 365, this can sometimes happen if some email-related configurations, such as authentication or filtering settings, are not fully set up or updated after the migration.
In the meantime, here are a few steps you might want to try:
-Check whether SPF and DKIM are properly configured for your domain, as these can affect how incoming emails are evaluated.
-Verify that your MX records are correctly pointing to Microsoft 365.
-Review your anti-spam policies in Microsoft Defender to ensure that the filtering level is not set too strictly.
If these DNS or configuration changes were made recently (such as MX, SPF, or DKIM updates), it may take up to 24 hours for them to fully take effect, so you may want to allow some time and monitor the behavior.
Please let me know how it goes, and I’ll be happy to assist further.
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