I have a very strange problem with my zimbra 8.8.4. Looks like the e-mail from mail.protection.outlook.com are rejected.
I'm quite newbie but I searched in logs and looks like nothing is present in zimbra.logs.
All other e-mails from other domains are received with success.
Please let me know if you have any idea why e-mails from mail.protection.outlook.com which is office 365 are rejected and doesn't appear in logs.
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