Impact of exceeding receiving limits from single sender

Question

According to the below page, There is sender-recipient pair limit. Single sender cannot exceed 33% of receiving limit.
If single sender exceed the limit, What is the impact?
It it same as Receiving limit as follows?
When the receiving limit has been exceeded on a mailbox, messages sent to the mailbox from the internet or on-premises senders will be returned to the sender in a non-delivery report (also known as an NDR or bounce message) stating that the mailbox has exceeded the maximum delivery threshold. Messages from internal senders will count against the limit, but won't be blocked if the receiving limit has been exceeded. After an hour, the limit will refresh and the mailbox will be able to receive messages.
<link>
exchange-online-limits

Answer 1

Hi @SATO Shiso ,
Yes. As described in Limits, this is a limit for a single sender.
If the sender is an internet sender or an on-prem sender, it will receive an NDR.
If the total number of messages received by a recipient in an hour does not exceed the limit, it won't affect the acceptance of messages from other senders.

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Answer 2

Yes, that sender will get a NDR if external or from on-prem but if internal, will not be blocked.