Hi,
Thanks for contacting our Exchange forum. In Exchange Server 2016, you can use attachment filtering on Edge Transport servers to control the attachments that users receive in email messages. Attachment filtering is performed by the Attachment Filtering agent.
After you define the files to look for, you can configure the action to take on messages that contain these attachments. You can't specify different actions for different types of attachments. You configure one of the following actions for all the messages
that match any of the attachment filters:
Reject (block) the message: The message is blocked. The sender receives a non-delivery report (also known as an NDR, delivery status notification, DSN, or bounce message) that explains that the message wasn't delivered because it contained
an unacceptable attachment. You can customize the text in the NDR. The default text is: Message rejected due to unacceptable attachments.
Strip the attachment but allow the message through: The attachment is removed from the message. However, the message itself and any other attachments that don't match the filter are allowed through. If an attachment is stripped, it's replaced
with a text file that explains why the attachment was removed. This is the default action.
Silently delete the message: The message is deleted. Neither the sender nor the recipient receives notification.
Please refer to:
https://technet.microsoft.com/en-us/library/bb124399(v=exchg.160).aspx
Hope it helps.
Regards,
Jason Chao
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