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Hi All,
We are using Exchange Online only With EOP as a mail filtering. we noticed Emails getting received in exchange online without attachment (.pdf,.csv etc). from a particular external sender.
We don't have any ETR blocking such extensions.
when we checked the EOP it doesn't have those attachments either. Running the content search and download the copy tells us same story missing attachment.
No additional policy is created to block such attachments in EOP as well
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(70.4, 18%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENM%3C/text%3E%3C/svg%3E)
Just checking in to see if above information was helpful.
If the issue has been resolved, please mark the helpful replies as answers.
What does message trace show? Review the details therein, it will show you each action taken on the message: https://learn.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-modern-eac
Exchange trace shows Delivered, nothing much about missing attachments no info there
Get the full details, not just the delivery status. If you are not seeing anything related to the attachment therein, it's likely that the attachment was removed before the message hit EOP.
In this situation, you can check the EOP settings if there are any specific attachment filtering rules for these files types. Also check the sender’s mail server settings.