Microsoft Related Exams
MS-203 Exam
NO: 30
You have a Microsoft Exchange Online tenant that contains 1,000 user mailboxes and 10 main enabled users. The mail-enabled users have email addresses in two SMTP domains named fabrikam.com and contoso.com.
You need to convert the mail-enabled users into user mailboxes.
What should you do first?
You recently implemented a hybrid deployment that contains a Microsoft Exchange Online tenant and an on-premises Exchange Server 2019 server named Server1. The public IP address of Server1 is 131.107.1.100.
The deployment is configured as shown in the following table.

Users hosted in Microsoft 365 report that they receive non-delivery reports (NDRs) when they attempt to send email messages to mailboxes hosted in Exchange Server 2019.
You need to ensure that the email is delivered successfully. The solution must ensure that email delivery is successful for all the users at your company.
What should you do?
Which contacts can sign in to and access resources in the adatum.com tenant?