Microsoft Exchange 2019 Hybrid - Cannot send email after two days setup (Azure VM)

[Guest Syaiful Fajripama]

Hi All,I have 2 VMs in Azure with no Enterprise Agreement.One for Active Directory and one for Exchange Server.&. I have M365 Organization with E3 & E5 subscription for my users.based on Microsoft's post, my subscription have the port blocked to send emails.that is why I setup 3rd party SMTP relay, in this case, I want to use M365 SMTP to send emails.The first day, all users in my organizationn are able to send emails.The next day and the rest, only the user that being the connector can send the email.Can you please tell me why?

 

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