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Email attachment changes to ".txt" automatically

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When receiving ATA notification via email, the Excel attachments gets changed into ".txt" by itself. It is only happening to one user who is on Office 365 meanwhile the users on-premise does not face this issue. The affected user when tries to open the attachment, it says "The attachment has been removed". There is no spam or malware filter/policies defined in Exchange Online and it is happening in OWA and Outlook client both.

Please help.

Sunday, July 28, 2019 12:14 PM

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Hello,

The following KB article may be helpful.

https://support.microsoft.com/en-us/help/2855809/email-message-attachments-are-removed-incorrectly-on-an-exchange-serve

Best regards,
Andy Liu
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Monday, July 29, 2019 2:34 AM
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Hello Andy,

We have Edge Transport server in place with latest KBs installed. Do you think the ATA is sending emails via Edge to Office 365 account? Because the affected user is on Office 365 not on-premise.

Regards

Monday, July 29, 2019 5:31 AM
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Hi, i would trace why O365 flagged it as malicious

start by seeing if the messages appear in exchange online quarantine

https://protection.office.com/quarantine

if you have Office365 TI, you could also use threat explorer to also understand why it was flagged: https://protection.office.com/threatexplorer

Or.
- Edited by Or TsemahMicrosoft employee Monday, July 29, 2019 12:02 PM
Monday, July 29, 2019 12:02 PM