What should you do?

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. Instruct the sender to reduce the email size and resend the email.
B. Increase the Maximum number of recipients in a message value.
C. Instruct the sender to wait 24 hours before resending the email.
D. Increase the Maximum size of a message sent value.


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