A company has a Microsoft Exchange Server 2019 environment. The company configures Exchange as follows:
* Email sent to the internet is routed through an SMTP relay host by using IPv4.
* Email sent to a partner is delivered to the partner's mail server.
You discover that emails are not being sent to external recipients due to missing DNS records.
You need to identity the required DNS records.
Which DNS records should you use? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

A company uses Exchange Online.
A user reports receiving the following non-delivery report (NDR) when sending an email:
5.2.2 Submission quota exceeded. The sender has exceeded the recipient rate limit.
What should you do?

A company uses Exchange Online.
A user reports that they did not receive an email from an external sender. You perform a message trace and observe the following in the message header SFV: BLK You need to resolve the issue.
Solution: Add the sender's email address to the recipient's allowed list Does the solution meet the goal?

A company uses a Microsoft Exchange Server 2019 hybrid environment. A user reports receiving the following error message:
System.Web.Services.Protocols.SoapHeaderException: An error occurred when verifying security for the message You need to troubleshoot the issue.
How should you complete the command? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

A company uses Exchange Online. An administrator deletes a mailbox named Userl when the user leaves the company. Six months later the user returns to the company. and the administrator creates a new mailbox named User1.
A user reports receiving the following non-delivery report (NDR) when they send an email to Userl:
RfSOlVER.-DR.E-RecipNotFojr.d; not found
You need to recommend a solution to resolve the issue. What should you recommend?