Exchange Online How to remove the attachment from NDR

Anonymous

People are sending mails to our tenant with malware in the attachment. The recipient is no longer there. An NDR with the same attachment is being sent to the sender.

How can I remove the attachment from the NDR in Exchange Online.

Yuki Sun-MSFT 41,016 Reputation points

2023-02-15T06:31:40.47+00:00

Hi @Taher Baker,

How can I remove the attachment from the NDR in Exchange Online.

Nothing that I am aware of can do this...

But just out of curiosity, why you are care about the attachment in the NDR as it's sent out to the original sender which is outside your tenant?
Fabricio Godoy 2,611 Reputation points

2023-02-17T01:54:25.4266667+00:00

Hello @Anonymous
u understand the information?
don't forget to upvote if yes.
Anonymous

2023-02-17T07:16:02.1933333+00:00

I need that because if someone sends an email to recipient that not exists anymore with malware attachment. So our Exchange online sends NDR with the malware in the attachment.

1 answer

Fabricio Godoy 2,611 Reputation points

2023-02-16T05:05:16.91+00:00

Hello @Anonymous

Unfortunately, by Mail Server design, this is not possible. (not only exchange server)

Attachment cannot be modified or removed by the sender or the recipient of the NDR, as it is automatically generated by the email server and is an integral part of the NDR message concept.

Regards
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Anonymous

2023-02-17T07:18:04.8633333+00:00

This option is there in exchange on-prem by reducing the size of the attachment to 0.

this is the command.

Set-TransportConfig -ExternalDsnMaxMessageAttachSize -InternalDsnMaxMessageAttachSize

Yuki Sun-MSFT 41,016 Reputation points

2023-02-17T07:47:09.0733333+00:00

Hi @Anonymous ,

True. But these two parameters are available only in on-premises Exchange. No equivalent in Exchange Online as I know...
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Exchange Online How to remove the attachment from NDR

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